Cutis

The Diagnosis: Cutaneous Mastocytosis

A shave skin biopsy from the right lateral breast and a punch skin biopsy from the right thigh showed similar histopathology. There were dermal predominantly perivascular aggregates of cells demonstrating basophilic granular cytoplasm and round to oval nuclei (Figure, A and B). These cells were highlighted by CD117 immunohistochemical stain (Figure, C), consistent with mastocytes. Additionally, occasional lymphocytes and rare eosinophils were noted. These histopathologic findings confirmed the diagnosis of cutaneous mastocytosis (CM). The patient’s complete blood cell count was within reference range, but serum tryptase was elevated at 15.7 μg/L (reference range, <11.0 μg/L), which prompted a bone marrow biopsy to rule out systemic mastocytosis (SM). The result showed normocellular bone marrow with no evidence of dysplasia or increased blasts, granuloma, lymphoproliferative disorder, or malignancy. Fluorescence in situ hybridization for PDGFRA (platelet-derived growth factor receptor alpha) and KIT mutation was negative. Because CM developed predominantly on the right breast where the patient previously had received radiation therapy, we concluded that this reaction was triggered by exposure to ionizing radiation.

Mastocytosis can be divided into 2 groups: CM and SM.¹ The histologic differential diagnosis of CM includes solitary mastocytoma, urticaria pigmentosa, telangiectasia macularis eruptiva perstans, and diffuse mastocytosis.² Clinicopathologic correlation is of crucial importance to render the final diagnosis in these disorders. Immunohistochemically, mast cells express CD177, CD5, CD68, tryptase, and chymase. Unlike normal mast cells, neoplastic cells express CD2 and/or CD25; CD25 is commonly expressed in cutaneous involvement by SM.²

Macdonald and Feiwel³ reported the first case of CM following ionizing radiation. Cutaneous mastocytosis is most common in female patients and presents with redbrown macules originating at the site of radiation therapy. Prior literature suggests that radiation-associated CM has a predilection for White patients⁴; however, our patient was Hispanic. It also is important to note that the presentation of this rash may differ in individuals with skin of color. In one case it spread beyond the radiation site.² Systemic mast call–mediated symptoms can occur in both CM and SM. The macules manifest as blanching with pressure.⁵ Typically these macules also are asymptomatic, though a positive Darier sign has been reported.^6,7 The interval between radiotherapy and CM has ranged from 3 to 24 months.²

Patients with CM should have a serum tryptase evaluation along with a complete blood cell count, serum biochemistry, and liver function tests. Elevated serum tryptase has a high positive predictive value for SM and should prompt a bone marrow biopsy. Our patient’s bone marrow biopsy results failed to establish SM; however, her serum tryptase levels will be carefully monitored going forward. At the time of publication, the skin macules were still persistent but not worsening or symptomatic.

Treatment is focused on symptomatic relief of cutaneous symptoms, if present; avoiding triggers of mast cell degranulation; and implementing the use of oral antihistamines and leukotriene antagonists as needed. Because our patient was completely asymptomatic, we did not recommend any topical or oral treatment. However, we do counsel patients on avoiding triggers of mast cell degranulation including nonsteroidal anti-inflammatory drugs, morphine and codeine derivatives, alcohol, certain anesthetics, and anticholinergic medications.⁸

Additional diagnoses were ruled out for the following reasons: Although lichen planus pigmentosus presents with ill-defined, oval, gray-brown macules, histopathology shows a bandlike lymphocytic infiltrate at the dermoepidermal junction. Solar lentiginosis is characterized by grouped tan macules in a sun-exposed distribution. A fixed drug eruption is a delayed hypersensitivity reaction, usually to an ingested medication, characterized by violaceous or hyperpigmented patches, with histopathology showing interface dermatitis with a lymphoeosinophilic infiltrate. Eruptive seborrheic keratoses can result from sunburn or dermatitis but does not show mastocytes on histopathology.⁸

In conclusion, dermatologists should be reminded of the rare possibility of CM when evaluating an atypical eruption in a prior radiation field.

The Diagnosis: Cutaneous Mastocytosis

A shave skin biopsy from the right lateral breast and a punch skin biopsy from the right thigh showed similar histopathology. There were dermal predominantly perivascular aggregates of cells demonstrating basophilic granular cytoplasm and round to oval nuclei (Figure, A and B). These cells were highlighted by CD117 immunohistochemical stain (Figure, C), consistent with mastocytes. Additionally, occasional lymphocytes and rare eosinophils were noted. These histopathologic findings confirmed the diagnosis of cutaneous mastocytosis (CM). The patient’s complete blood cell count was within reference range, but serum tryptase was elevated at 15.7 μg/L (reference range, <11.0 μg/L), which prompted a bone marrow biopsy to rule out systemic mastocytosis (SM). The result showed normocellular bone marrow with no evidence of dysplasia or increased blasts, granuloma, lymphoproliferative disorder, or malignancy. Fluorescence in situ hybridization for PDGFRA (platelet-derived growth factor receptor alpha) and KIT mutation was negative. Because CM developed predominantly on the right breast where the patient previously had received radiation therapy, we concluded that this reaction was triggered by exposure to ionizing radiation.

Mastocytosis can be divided into 2 groups: CM and SM.¹ The histologic differential diagnosis of CM includes solitary mastocytoma, urticaria pigmentosa, telangiectasia macularis eruptiva perstans, and diffuse mastocytosis.² Clinicopathologic correlation is of crucial importance to render the final diagnosis in these disorders. Immunohistochemically, mast cells express CD177, CD5, CD68, tryptase, and chymase. Unlike normal mast cells, neoplastic cells express CD2 and/or CD25; CD25 is commonly expressed in cutaneous involvement by SM.²

Macdonald and Feiwel³ reported the first case of CM following ionizing radiation. Cutaneous mastocytosis is most common in female patients and presents with redbrown macules originating at the site of radiation therapy. Prior literature suggests that radiation-associated CM has a predilection for White patients⁴; however, our patient was Hispanic. It also is important to note that the presentation of this rash may differ in individuals with skin of color. In one case it spread beyond the radiation site.² Systemic mast call–mediated symptoms can occur in both CM and SM. The macules manifest as blanching with pressure.⁵ Typically these macules also are asymptomatic, though a positive Darier sign has been reported.^6,7 The interval between radiotherapy and CM has ranged from 3 to 24 months.²

Patients with CM should have a serum tryptase evaluation along with a complete blood cell count, serum biochemistry, and liver function tests. Elevated serum tryptase has a high positive predictive value for SM and should prompt a bone marrow biopsy. Our patient’s bone marrow biopsy results failed to establish SM; however, her serum tryptase levels will be carefully monitored going forward. At the time of publication, the skin macules were still persistent but not worsening or symptomatic.

Treatment is focused on symptomatic relief of cutaneous symptoms, if present; avoiding triggers of mast cell degranulation; and implementing the use of oral antihistamines and leukotriene antagonists as needed. Because our patient was completely asymptomatic, we did not recommend any topical or oral treatment. However, we do counsel patients on avoiding triggers of mast cell degranulation including nonsteroidal anti-inflammatory drugs, morphine and codeine derivatives, alcohol, certain anesthetics, and anticholinergic medications.⁸

Additional diagnoses were ruled out for the following reasons: Although lichen planus pigmentosus presents with ill-defined, oval, gray-brown macules, histopathology shows a bandlike lymphocytic infiltrate at the dermoepidermal junction. Solar lentiginosis is characterized by grouped tan macules in a sun-exposed distribution. A fixed drug eruption is a delayed hypersensitivity reaction, usually to an ingested medication, characterized by violaceous or hyperpigmented patches, with histopathology showing interface dermatitis with a lymphoeosinophilic infiltrate. Eruptive seborrheic keratoses can result from sunburn or dermatitis but does not show mastocytes on histopathology.⁸

In conclusion, dermatologists should be reminded of the rare possibility of CM when evaluating an atypical eruption in a prior radiation field.

The Diagnosis: Cutaneous Mastocytosis

A shave skin biopsy from the right lateral breast and a punch skin biopsy from the right thigh showed similar histopathology. There were dermal predominantly perivascular aggregates of cells demonstrating basophilic granular cytoplasm and round to oval nuclei (Figure, A and B). These cells were highlighted by CD117 immunohistochemical stain (Figure, C), consistent with mastocytes. Additionally, occasional lymphocytes and rare eosinophils were noted. These histopathologic findings confirmed the diagnosis of cutaneous mastocytosis (CM). The patient’s complete blood cell count was within reference range, but serum tryptase was elevated at 15.7 μg/L (reference range, <11.0 μg/L), which prompted a bone marrow biopsy to rule out systemic mastocytosis (SM). The result showed normocellular bone marrow with no evidence of dysplasia or increased blasts, granuloma, lymphoproliferative disorder, or malignancy. Fluorescence in situ hybridization for PDGFRA (platelet-derived growth factor receptor alpha) and KIT mutation was negative. Because CM developed predominantly on the right breast where the patient previously had received radiation therapy, we concluded that this reaction was triggered by exposure to ionizing radiation.

Mastocytosis can be divided into 2 groups: CM and SM.¹ The histologic differential diagnosis of CM includes solitary mastocytoma, urticaria pigmentosa, telangiectasia macularis eruptiva perstans, and diffuse mastocytosis.² Clinicopathologic correlation is of crucial importance to render the final diagnosis in these disorders. Immunohistochemically, mast cells express CD177, CD5, CD68, tryptase, and chymase. Unlike normal mast cells, neoplastic cells express CD2 and/or CD25; CD25 is commonly expressed in cutaneous involvement by SM.²

Macdonald and Feiwel³ reported the first case of CM following ionizing radiation. Cutaneous mastocytosis is most common in female patients and presents with redbrown macules originating at the site of radiation therapy. Prior literature suggests that radiation-associated CM has a predilection for White patients⁴; however, our patient was Hispanic. It also is important to note that the presentation of this rash may differ in individuals with skin of color. In one case it spread beyond the radiation site.² Systemic mast call–mediated symptoms can occur in both CM and SM. The macules manifest as blanching with pressure.⁵ Typically these macules also are asymptomatic, though a positive Darier sign has been reported.^6,7 The interval between radiotherapy and CM has ranged from 3 to 24 months.²

Patients with CM should have a serum tryptase evaluation along with a complete blood cell count, serum biochemistry, and liver function tests. Elevated serum tryptase has a high positive predictive value for SM and should prompt a bone marrow biopsy. Our patient’s bone marrow biopsy results failed to establish SM; however, her serum tryptase levels will be carefully monitored going forward. At the time of publication, the skin macules were still persistent but not worsening or symptomatic.

Treatment is focused on symptomatic relief of cutaneous symptoms, if present; avoiding triggers of mast cell degranulation; and implementing the use of oral antihistamines and leukotriene antagonists as needed. Because our patient was completely asymptomatic, we did not recommend any topical or oral treatment. However, we do counsel patients on avoiding triggers of mast cell degranulation including nonsteroidal anti-inflammatory drugs, morphine and codeine derivatives, alcohol, certain anesthetics, and anticholinergic medications.⁸

Additional diagnoses were ruled out for the following reasons: Although lichen planus pigmentosus presents with ill-defined, oval, gray-brown macules, histopathology shows a bandlike lymphocytic infiltrate at the dermoepidermal junction. Solar lentiginosis is characterized by grouped tan macules in a sun-exposed distribution. A fixed drug eruption is a delayed hypersensitivity reaction, usually to an ingested medication, characterized by violaceous or hyperpigmented patches, with histopathology showing interface dermatitis with a lymphoeosinophilic infiltrate. Eruptive seborrheic keratoses can result from sunburn or dermatitis but does not show mastocytes on histopathology.⁸

In conclusion, dermatologists should be reminded of the rare possibility of CM when evaluating an atypical eruption in a prior radiation field.

To the Editor:

Female pattern hair loss (FPHL), or androgenetic alopecia (AGA), is the most common form of alopecia worldwide and is characterized by a reduction of hair follicles spent in the anagen phase of growth as well as progressive terminal hair loss.¹ It is caused by an excessive response to androgens and leads to the characteristic distribution of hair loss in both sexes. Studies have shown a notable association between AGA and markers of metabolic syndrome such as dyslipidemia, insulin resistance, and obesity in age- and sex-matched controls.^2,3 However, research describing the relationship between AGA severity and these markers is scarce.

To understand the relationship between FPHL severity and abnormal cholesterol levels, we performed a retrospective chart review of patients diagnosed with FPHL at a specialty alopecia clinic from June 2022 to December 2022. Patient age and age at onset of FPHL were collected. The severity of FPHL was measured using the Sinclair scale (score range, 1–5) and unidentifiable patient photographs. Laboratory values were collected; abnormal cholesterol was defined by the American Heart Association as having a low-density lipoprotein cholesterol (LDL-C) level of 100 mg/dL or higher.⁴ Finally, data on medication use were noted to understand patient treatment status (Table).

We identified 54 female patients with FPHL with an average age of 59 years (range, 34–80 years). Thirty-three females (61.11%) had a normal LDL-C level and 21 (38.89%) had an abnormal level. The mean (SD) LDL-C level was 66.02 (15.20) mg/dL (range, 29–92 mg/dL) in the group with normal levels and 138.81 (29.90) mg/dL (range, 100–193 mg/dL) in the group with abnormal levels. Patients with abnormal LDL-C had significantly higher Sinclair scale scores compared to those with normal levels (2.43 vs 1.91; P=.01). There were no significant differences in patient age (58.71 vs 59.70 years; P=.39), age at onset of AGA (47.75 vs 47.65 years; P=.49), history of polycystic ovary syndrome (9.52% vs 6.06%; P=.64), or statin use (38.09% vs 36.36%; P=.89) between patients with abnormal and normal LDL-C levels, respectively. There also were no significant differences in ferritin (96.42 vs 91.54 ng/mL; P=.40), vitamin D (42.35 vs 48.96 ng/mL; P=.09), or hemoglobin A_1c levels (5.60 ng/mL vs 5.38 ng/mL; P=.06)—variables that could have confounded this relationship. Triglycerides were within reference range in both groups (121.36 vs 116.16 mg/dL; P=.32), while total cholesterol was mildly elevated in both groups but not significantly different (213.19 vs 201.21 mg/dL; P=.13). Use of hair loss treatments such as topical minoxidil (14.29% vs 21.21%; P=.53), oral low-dose minoxidil (57.14% vs 66.67%; P=.48), oral spironolactone (47.62% vs 57.58%; P=.47), and platelet-rich plasma injections (47.62% vs 27.27%; P=.90) were not significantly different across both groups.

The data suggest a significant (P<.05) association between abnormal LDL-C and hair loss severity in FPHL patients. Our study was limited by its small sample size and lack of causality; however, it coincides with and reiterates the findings established in the literature. The mechanism of the association between hyperlipidemia and AGA is not well understood but is thought to stem from the homology between cholesterol and androgens. Increased cholesterol release from dermal adipocytes and subsequent absorption into hair follicle cell populations may increase hair follicle steroidogenesis, thereby accelerating the anagen-catagen transition and inducing AGA. Alternatively, impaired cholesterol homeostasis may disrupt normal hair follicle cycling by interrupting signaling pathways in follicle proliferation and differentiation.⁵ Adequate control and monitoring of LDL-C levels may be important, particularly in patients with more severe FPHL.

To the Editor:

Female pattern hair loss (FPHL), or androgenetic alopecia (AGA), is the most common form of alopecia worldwide and is characterized by a reduction of hair follicles spent in the anagen phase of growth as well as progressive terminal hair loss.¹ It is caused by an excessive response to androgens and leads to the characteristic distribution of hair loss in both sexes. Studies have shown a notable association between AGA and markers of metabolic syndrome such as dyslipidemia, insulin resistance, and obesity in age- and sex-matched controls.^2,3 However, research describing the relationship between AGA severity and these markers is scarce.

To understand the relationship between FPHL severity and abnormal cholesterol levels, we performed a retrospective chart review of patients diagnosed with FPHL at a specialty alopecia clinic from June 2022 to December 2022. Patient age and age at onset of FPHL were collected. The severity of FPHL was measured using the Sinclair scale (score range, 1–5) and unidentifiable patient photographs. Laboratory values were collected; abnormal cholesterol was defined by the American Heart Association as having a low-density lipoprotein cholesterol (LDL-C) level of 100 mg/dL or higher.⁴ Finally, data on medication use were noted to understand patient treatment status (Table).

We identified 54 female patients with FPHL with an average age of 59 years (range, 34–80 years). Thirty-three females (61.11%) had a normal LDL-C level and 21 (38.89%) had an abnormal level. The mean (SD) LDL-C level was 66.02 (15.20) mg/dL (range, 29–92 mg/dL) in the group with normal levels and 138.81 (29.90) mg/dL (range, 100–193 mg/dL) in the group with abnormal levels. Patients with abnormal LDL-C had significantly higher Sinclair scale scores compared to those with normal levels (2.43 vs 1.91; P=.01). There were no significant differences in patient age (58.71 vs 59.70 years; P=.39), age at onset of AGA (47.75 vs 47.65 years; P=.49), history of polycystic ovary syndrome (9.52% vs 6.06%; P=.64), or statin use (38.09% vs 36.36%; P=.89) between patients with abnormal and normal LDL-C levels, respectively. There also were no significant differences in ferritin (96.42 vs 91.54 ng/mL; P=.40), vitamin D (42.35 vs 48.96 ng/mL; P=.09), or hemoglobin A_1c levels (5.60 ng/mL vs 5.38 ng/mL; P=.06)—variables that could have confounded this relationship. Triglycerides were within reference range in both groups (121.36 vs 116.16 mg/dL; P=.32), while total cholesterol was mildly elevated in both groups but not significantly different (213.19 vs 201.21 mg/dL; P=.13). Use of hair loss treatments such as topical minoxidil (14.29% vs 21.21%; P=.53), oral low-dose minoxidil (57.14% vs 66.67%; P=.48), oral spironolactone (47.62% vs 57.58%; P=.47), and platelet-rich plasma injections (47.62% vs 27.27%; P=.90) were not significantly different across both groups.

The data suggest a significant (P<.05) association between abnormal LDL-C and hair loss severity in FPHL patients. Our study was limited by its small sample size and lack of causality; however, it coincides with and reiterates the findings established in the literature. The mechanism of the association between hyperlipidemia and AGA is not well understood but is thought to stem from the homology between cholesterol and androgens. Increased cholesterol release from dermal adipocytes and subsequent absorption into hair follicle cell populations may increase hair follicle steroidogenesis, thereby accelerating the anagen-catagen transition and inducing AGA. Alternatively, impaired cholesterol homeostasis may disrupt normal hair follicle cycling by interrupting signaling pathways in follicle proliferation and differentiation.⁵ Adequate control and monitoring of LDL-C levels may be important, particularly in patients with more severe FPHL.

To the Editor:

Female pattern hair loss (FPHL), or androgenetic alopecia (AGA), is the most common form of alopecia worldwide and is characterized by a reduction of hair follicles spent in the anagen phase of growth as well as progressive terminal hair loss.¹ It is caused by an excessive response to androgens and leads to the characteristic distribution of hair loss in both sexes. Studies have shown a notable association between AGA and markers of metabolic syndrome such as dyslipidemia, insulin resistance, and obesity in age- and sex-matched controls.^2,3 However, research describing the relationship between AGA severity and these markers is scarce.

To understand the relationship between FPHL severity and abnormal cholesterol levels, we performed a retrospective chart review of patients diagnosed with FPHL at a specialty alopecia clinic from June 2022 to December 2022. Patient age and age at onset of FPHL were collected. The severity of FPHL was measured using the Sinclair scale (score range, 1–5) and unidentifiable patient photographs. Laboratory values were collected; abnormal cholesterol was defined by the American Heart Association as having a low-density lipoprotein cholesterol (LDL-C) level of 100 mg/dL or higher.⁴ Finally, data on medication use were noted to understand patient treatment status (Table).

We identified 54 female patients with FPHL with an average age of 59 years (range, 34–80 years). Thirty-three females (61.11%) had a normal LDL-C level and 21 (38.89%) had an abnormal level. The mean (SD) LDL-C level was 66.02 (15.20) mg/dL (range, 29–92 mg/dL) in the group with normal levels and 138.81 (29.90) mg/dL (range, 100–193 mg/dL) in the group with abnormal levels. Patients with abnormal LDL-C had significantly higher Sinclair scale scores compared to those with normal levels (2.43 vs 1.91; P=.01). There were no significant differences in patient age (58.71 vs 59.70 years; P=.39), age at onset of AGA (47.75 vs 47.65 years; P=.49), history of polycystic ovary syndrome (9.52% vs 6.06%; P=.64), or statin use (38.09% vs 36.36%; P=.89) between patients with abnormal and normal LDL-C levels, respectively. There also were no significant differences in ferritin (96.42 vs 91.54 ng/mL; P=.40), vitamin D (42.35 vs 48.96 ng/mL; P=.09), or hemoglobin A_1c levels (5.60 ng/mL vs 5.38 ng/mL; P=.06)—variables that could have confounded this relationship. Triglycerides were within reference range in both groups (121.36 vs 116.16 mg/dL; P=.32), while total cholesterol was mildly elevated in both groups but not significantly different (213.19 vs 201.21 mg/dL; P=.13). Use of hair loss treatments such as topical minoxidil (14.29% vs 21.21%; P=.53), oral low-dose minoxidil (57.14% vs 66.67%; P=.48), oral spironolactone (47.62% vs 57.58%; P=.47), and platelet-rich plasma injections (47.62% vs 27.27%; P=.90) were not significantly different across both groups.

The data suggest a significant (P<.05) association between abnormal LDL-C and hair loss severity in FPHL patients. Our study was limited by its small sample size and lack of causality; however, it coincides with and reiterates the findings established in the literature. The mechanism of the association between hyperlipidemia and AGA is not well understood but is thought to stem from the homology between cholesterol and androgens. Increased cholesterol release from dermal adipocytes and subsequent absorption into hair follicle cell populations may increase hair follicle steroidogenesis, thereby accelerating the anagen-catagen transition and inducing AGA. Alternatively, impaired cholesterol homeostasis may disrupt normal hair follicle cycling by interrupting signaling pathways in follicle proliferation and differentiation.⁵ Adequate control and monitoring of LDL-C levels may be important, particularly in patients with more severe FPHL.

Acne vulgaris, or acne, is a highly common inflammatory skin disorder affecting up to 85% of the population, and it constitutes the most commonly presenting chief concern in routine dermatology practice.¹ Older teenagers and young adults are most often affected by acne.² Although acne generally is more common in males, adult-onset acne occurs more frequently in women.^2,3 Black and Hispanic women are at higher risk for acne compared to those of Asian, White, or Continental Indian descent.⁴ As such, acne is a common concern in all women of childbearing age.

Concerns for maternal and fetal safety are important therapeutic considerations, especially because hormonal and physiologic changes in pregnancy can lead to onset of inflammatory acne lesions, particularly during the second and third trimesters.⁵ Female patients younger than 25 years; with a higher body mass index, prior irregular menstruation, or polycystic ovary syndrome; or those experiencing their first pregnancy are thought to be more commonly affected.^5-7 In fact, acne affects up to 43% of pregnant women, and lesions typically extend beyond the face to involve the trunk.^6,8-10 Importantly, one-third of women with a history of acne experience symptom relapse after disease-free periods, while two-thirds of those with ongoing disease experience symptom deterioration during pregnancy.¹⁰ Although acne is not a life-threatening condition, it has a well-documented, detrimental impact on social, emotional, and psychological well-being, namely self-perception, social interactions, quality-of-life scores, depression, and anxiety.¹¹

Therefore, safe and effective treatment of pregnant women is of paramount importance. Because pregnant women are not included in clinical trials, there is a paucity of medication safety data, further augmented by inefficient access to available information. The US Food and Drug Administration (FDA) pregnancy safety categories were updated in 2015, letting go of the traditional A, B, C, D, and X categories.¹² The Table reviews the current pregnancy classification system. In this narrative review, we summarize the most recent available data and recommendations on the safety and efficacy of acne treatment during pregnancy.

Topical Treatments for Acne

Benzoyl Peroxide—Benzoyl peroxide commonly is used as first-line therapy alone or in combination with other agents for the treatment of mild to moderate acne.¹³ It is safe for use during pregnancy.¹⁴ Although the medication is systemically absorbed, it undergoes complete metabolism to benzoic acid, a commonly used food additive.^15,16 Benzoic acid has low bioavailability, as it gets rapidly metabolized by the kidneys; therefore, benzoyl peroxide is unlikely to reach clinically significant levels in the maternal circulation and consequently the fetal circulation. Additionally, it has a low risk for causing congenital malformations.¹⁷

Salicylic Acid—For mild to moderate acne, salicylic acid is a second-line agent that likely is safe for use by pregnant women at low concentrations and over limited body surface areas.^14,18,19 There is minimal systemic absorption of the drug.²⁰ Additionally, aspirin, which is broken down in the body into salicylic acid, is used in low doses for the treatment of pre-eclampsia during pregnancy.²¹

Dapsone—The use of dapsone gel 5% as a second-line agent has shown efficacy for mild to moderate acne.²² The oral formulation, commonly used for malaria and leprosy prophylaxis, has failed to show associated fetal toxicity or congenital anomalies.^23,24 It also has been used as a first-line treatment for dermatitis herpetiformis in pregnancy.²⁵ Although the medication likely is safe, it is better to minimize its use during the third trimester to reduce the theoretical risk for hyperbilirubinemia in the neonate.^17,26-29

Azelaic Acid—Azelaic acid effectively targets noninflammatory and inflammatory acne and generally is well tolerated, harboring a good safety profile.³⁰ Topical 20% azelaic acid has localized antibacterial and comedolytic effects and is safe for use during pregnancy.^31,32

Glycolic Acid—Limited data exist on the safety of glycolic acid during pregnancy. In vitro studies have shown up to 27% systemic absorption depending on pH, concentration, and duration of application.³³ Animal reproductive studies involving rats have shown fetal multisystem malformations and developmental abnormalities with oral administration of glycolic acid at doses far exceeding those used in humans.³⁴ Although no human reproductive studies exist, topical glycolic acid is unlikely to reach the developing fetus in notable amounts, and the medication is likely safe for use.^17,35

Clindamycin—Topical clindamycin phosphate is an effective and well-tolerated agent for the treatment of mild to moderate acne.³⁶ Its systemic absorption is minimal, and it is considered safe for use during all trimesters of pregnancy.^{14,17,26,27,35,37}

Erythromycin—Topical erythromycin is another commonly prescribed topical antibiotic used to target mild to moderate acne. However, its use recently has been associated with a decrease in efficacy secondary to the rise of antibacterial resistance in the community.^38-40 Nevertheless, it remains a safe treatment for use during all trimesters of pregnancy.^{14,17,26,27,35,37}

Topical Retinoids—Vitamin A derivatives (also known as retinoids) are the mainstay for the treatment of mild to moderate acne. Limited data exist regarding pregnancy outcomes after in utero exposure.⁴¹ A rare case report suggested topical tretinoin has been associated with fetal otocerebral anomalies.⁴² For tazarotene, teratogenic effects were seen in animal reproductive studies at doses exceeding maximum recommended human doses.^41,43 However, a large meta-analysis failed to find a clear risk for increased congenital malformations, spontaneous abortions, stillbirth, elective termination of pregnancy, low birthweight, or prematurity following first-trimester exposure to topical retinoids.⁴⁴ As the level of exposure that could lead to teratogenicity in humans is unknown, avoidance of both tretinoin and tazarotene is recommended in pregnant women.^41,45 Nevertheless, women inadvertently exposed should be reassured.⁴⁴

Conversely, adapalene has been associated with 1 case of anophthalmia and agenesis of the optic chiasma in a fetus following exposure until 13 weeks’ gestation.⁴⁶ However, a large, open-label trial prior to the patient transitioning from adapalene to over-the-counter treatment showed that the drug harbors a large and reassuring margin of safety and no risk for teratogenicity in a maximal usage trial and Pregnancy Safety Review.⁴⁷ Therefore, adapalene gel 0.1% is a safe and effective medication for the treatment of acne in a nonprescription environment and does not pose harm to the fetus.

Clascoterone—Clascoterone is a novel topical antiandrogenic drug approved for the treatment of hormonal and inflammatory moderate to severe acne.^48-51 Human reproductive data are limited to 1 case of pregnancy that occurred during phase 3 trial investigations, and no adverse outcomes were reported.⁵¹ Minimal systemic absorption follows topical use.⁵² Nonetheless, dose-independent malformations were reported in animal reproductive studies.⁵³ As such, it remains better to avoid the use of clascoterone during pregnancy pending further safety data.

Minocycline Foam—Minocycline foam 4% is approved to treat inflammatory lesions of nonnodular moderate to severe acne in patients 9 years and older.⁵⁴ Systemic absorption is minimal, and the drug has limited bioavailability with minimal systemic accumulation in the patient’s serum.⁵⁵ Given this information, it is unlikely that topical minocycline will reach notable levels in the fetal serum or harbor teratogenic effects, as seen with the oral formulation.⁵⁶ However, it may be best to avoid its use during the second and third trimesters given the potential risk for tooth discoloration in the fetus.^57,58

Systemic Treatments for Acne

Isotretinoin—Isotretinoin is the most effective treatment for moderate to severe acne with a well-documented potential for long-term clearance.⁵⁹ Its use during pregnancy is absolutely contraindicated, as the medication is a well-known teratogen. Associated congenital malformations include numerous craniofacial defects, cardiovascular and neurologic malformations, or thymic disorders that are estimated to affect 20% to 35% of infants exposed in utero.⁶⁰ Furthermore, strict contraception use during treatment is mandated for patients who can become pregnant. It is recommended to wait at least 1 month and 1 menstrual cycle after medication discontinuation before attempting to conceive.¹⁷ Pregnancy termination is recommended if conception occurs during treatment with isotretinoin.

Spironolactone—Spironolactone is an androgen-receptor antagonist commonly prescribed off label for mild to severe acne in females.^61,62 Spironolactone promotes the feminization of male fetuses and should be avoided in pregnancy.⁶³

Doxycycline/Minocycline—Tetracyclines are the most commonly prescribed oral antibiotics for moderate to severe acne.⁶⁴ Although highly effective at treating acne, tetracyclines generally should be avoided in pregnancy. First-trimester use of doxycycline is not absolutely contraindicated but should be reserved for severe illness and not employed for the treatment of acne. However, accidental exposure to doxycycline has not been associated with congenital malformations.⁶⁵ Nevertheless, after the 15th week of gestation, permanent tooth discoloration and bone growth inhibition in the fetus are serious and well-documented risks.^14,17 Additional adverse events following in utero exposure include infantile inguinal hernia, hypospadias, and limb hypoplasia.⁶³

Sarecycline—Sarecycline is a novel tetracycline-class antibiotic for the treatment of moderate to severe inflammatory acne. It has a narrower spectrum of activity compared to its counterparts within its class, which translates to an improved safety profile, namely when it comes to gastrointestinal tract microbiome disruption and potentially decreased likelihood of developing bacterial resistance.⁶⁶ Data on human reproductive studies are limited, but it is advisable to avoid sarecycline in pregnancy, as it may cause adverse developmental effects in the fetus, such as reduced bone growth, in addition to the well-known tetracycline-associated risk for permanent discoloration of the teeth if used during the second and third trimesters.^67,68

Erythromycin—Oral erythromycin targets moderate to severe inflammatory acne and is considered safe for use during pregnancy.^69,70 There has been 1 study reporting an increased risk for atrial and ventricular septal defects (1.8%) and pyloric stenosis (0.2%), but these risks are still uncertain, and erythromycin is considered compatible with pregnancy.⁷¹ However, erythromycin estolate formulations should be avoided given the associated 10% to 15% risk for reversible cholestatic liver injury.⁷² Erythromycin base or erythromycin ethylsuccinate formulations should be favored.

Systemic Steroids—Prednisone is indicated for severe acne with scarring and should only be used during pregnancy after clearance from the patient’s obstetrician. Doses of 0.5 mg/kg or less should be prescribed in combination with systemic antibiotics as well as agents for bone and gastrointestinal tract prophylaxis.²⁹

Zinc—The exact mechanism by which zinc exerts its effects to improve acne remains largely obscure. It has been found effective against inflammatory lesions of mild to moderate acne.⁷³ Generally recommended dosages range from 30 to 200 mg/d but may be associated with gastrointestinal tract disturbances. Dosages of 75 mg/d have shown no harm to the fetus.⁷⁴ When taking this supplement, patients should not exceed the recommended doses given the risk for hypocupremia associated with high-dose zinc supplementation.

Light-Based Therapies

Phototherapy—Narrowband UVB phototherapy is effective for the treatment of mild to moderate acne.⁷⁵ It has been proven to be a safe treatment option during pregnancy, but its use has been associated with decreased folic acid levels.^76-79 Therefore, in addition to attaining baseline folic acid serum levels, supplementation with folic acid prior to treatment, as per routine prenatal guidelines, should be sought.⁸⁰

AviClear—The AviClear (Cutera) laser is the first device cleared by the FDA for mild to severe acne in March 2022.⁸¹ The FDA clearance for the Accure (Accure Acne Inc) laser, also targeting mild to severe acne, followed soon after (November 2022). Both lasers harbor a wavelength of 1726 nm and target sebaceous glands with electrothermolysis.^82,83 Further research and long-term safety data are required before using them in pregnancy.

Other Therapies

Cosmetic Peels—Glycolic acid peels induce epidermolysis and desquamation.⁸⁴ Although data on use during pregnancy are limited, these peels have limited dermal penetration and are considered safe for use in pregnancy.^33,85,86 Similarly, keratolytic lactic acid peels harbor limited dermal penetration and can be safely used in pregnant women.^87-89 Salicylic acid peels also work through epidermolysis and desquamation⁸⁴; however, they tend to penetrate deeper into the skin, reaching down to the basal layer, if large areas are treated or when applied under occlusion.^86,90 Although their use is not contraindicated in pregnancy, they should be limited to small areas of coverage.⁹¹

Intralesional Triamcinolone—Acne cysts and inflammatory papules can be treated with intralesional triamcinolone injections to relieve acute symptoms such as pain.⁹² Low doses at concentrations of 2.5 mg/mL are considered compatible with pregnancy when indicated.²⁹

Approaching the Patient Clinical Encounter

In patients seeking treatment prior to conception, a few recommendations can be made to minimize the risk for acne recurrence or flares during pregnancy. For instance, because data show an association between increased acne severity in those with a higher body mass index and in pregnancy, weight loss may be recommended prior to pregnancy to help mitigate symptoms after conception.⁷ The Figure summarizes our recommendations for approaching and treating acne in pregnancy.

In all patients, grading the severity of the patient’s acne as mild, moderate, or severe is the first step. The presence of scarring is an additional consideration during the physical examination and should be documented. A careful discussion of treatment expectations and prognosis should be the focus before treatment initiation. Meticulous documentation of the physical examination and discussion with the patient should be prioritized.

To minimize toxicity and risks to the developing fetus, monotherapy is favored. Topical therapy should be considered first line. Safe regimens include mild nonabrasive washes, such as those containing benzoyl peroxide or glycolic acid, or topical azelaic acid or clindamycin phosphate for mild to moderate acne. More severe cases warrant the consideration of systemic medications as second line, as more severe acne is better treated with oral antibiotics such as the macrolides erythromycin or clindamycin or systemic corticosteroids when concern exists for severe scarring. The additional use of physical sunscreen also is recommended.

An important topic to address during the clinical encounter is cautious intake of oral supplements for acne during pregnancy, as they may contain harmful and teratogenic ingredients. A recent search focusing on acne supplements available online between March and May 2020 uncovered 49 different supplements, 26 (53%) of which contained vitamin A.⁹³ Importantly, 3 (6%) of these 49 supplements were likely teratogenic, 4 (8%) contained vitamin A doses exceeding the recommended daily nutritional intake level, and 15 (31%) harbored an unknown teratogenic risk. Furthermore, among the 6 (12%) supplements with vitamin A levels exceeding 10,000 IU, 2 lacked any mention of pregnancy warning, including the supplement with the highest vitamin A dose found in this study.⁹³ Because dietary supplements are not subject to the same stringent regulations by the FDA as drugs, inadvertent use by unaware patients ought to be prevented by careful counseling and education.

Finally, patients should be counseled to seek care following delivery for potentially updated medication management of acne, especially if they are breastfeeding. Co-management with a pediatrician may be indicated during lactation, particularly when newborns are born preterm or with other health conditions that may warrant additional caution with the use of certain agents.

Acne vulgaris, or acne, is a highly common inflammatory skin disorder affecting up to 85% of the population, and it constitutes the most commonly presenting chief concern in routine dermatology practice.¹ Older teenagers and young adults are most often affected by acne.² Although acne generally is more common in males, adult-onset acne occurs more frequently in women.^2,3 Black and Hispanic women are at higher risk for acne compared to those of Asian, White, or Continental Indian descent.⁴ As such, acne is a common concern in all women of childbearing age.

Concerns for maternal and fetal safety are important therapeutic considerations, especially because hormonal and physiologic changes in pregnancy can lead to onset of inflammatory acne lesions, particularly during the second and third trimesters.⁵ Female patients younger than 25 years; with a higher body mass index, prior irregular menstruation, or polycystic ovary syndrome; or those experiencing their first pregnancy are thought to be more commonly affected.^5-7 In fact, acne affects up to 43% of pregnant women, and lesions typically extend beyond the face to involve the trunk.^6,8-10 Importantly, one-third of women with a history of acne experience symptom relapse after disease-free periods, while two-thirds of those with ongoing disease experience symptom deterioration during pregnancy.¹⁰ Although acne is not a life-threatening condition, it has a well-documented, detrimental impact on social, emotional, and psychological well-being, namely self-perception, social interactions, quality-of-life scores, depression, and anxiety.¹¹

Therefore, safe and effective treatment of pregnant women is of paramount importance. Because pregnant women are not included in clinical trials, there is a paucity of medication safety data, further augmented by inefficient access to available information. The US Food and Drug Administration (FDA) pregnancy safety categories were updated in 2015, letting go of the traditional A, B, C, D, and X categories.¹² The Table reviews the current pregnancy classification system. In this narrative review, we summarize the most recent available data and recommendations on the safety and efficacy of acne treatment during pregnancy.

Topical Treatments for Acne

Benzoyl Peroxide—Benzoyl peroxide commonly is used as first-line therapy alone or in combination with other agents for the treatment of mild to moderate acne.¹³ It is safe for use during pregnancy.¹⁴ Although the medication is systemically absorbed, it undergoes complete metabolism to benzoic acid, a commonly used food additive.^15,16 Benzoic acid has low bioavailability, as it gets rapidly metabolized by the kidneys; therefore, benzoyl peroxide is unlikely to reach clinically significant levels in the maternal circulation and consequently the fetal circulation. Additionally, it has a low risk for causing congenital malformations.¹⁷

Salicylic Acid—For mild to moderate acne, salicylic acid is a second-line agent that likely is safe for use by pregnant women at low concentrations and over limited body surface areas.^14,18,19 There is minimal systemic absorption of the drug.²⁰ Additionally, aspirin, which is broken down in the body into salicylic acid, is used in low doses for the treatment of pre-eclampsia during pregnancy.²¹

Dapsone—The use of dapsone gel 5% as a second-line agent has shown efficacy for mild to moderate acne.²² The oral formulation, commonly used for malaria and leprosy prophylaxis, has failed to show associated fetal toxicity or congenital anomalies.^23,24 It also has been used as a first-line treatment for dermatitis herpetiformis in pregnancy.²⁵ Although the medication likely is safe, it is better to minimize its use during the third trimester to reduce the theoretical risk for hyperbilirubinemia in the neonate.^17,26-29

Azelaic Acid—Azelaic acid effectively targets noninflammatory and inflammatory acne and generally is well tolerated, harboring a good safety profile.³⁰ Topical 20% azelaic acid has localized antibacterial and comedolytic effects and is safe for use during pregnancy.^31,32

Glycolic Acid—Limited data exist on the safety of glycolic acid during pregnancy. In vitro studies have shown up to 27% systemic absorption depending on pH, concentration, and duration of application.³³ Animal reproductive studies involving rats have shown fetal multisystem malformations and developmental abnormalities with oral administration of glycolic acid at doses far exceeding those used in humans.³⁴ Although no human reproductive studies exist, topical glycolic acid is unlikely to reach the developing fetus in notable amounts, and the medication is likely safe for use.^17,35

Clindamycin—Topical clindamycin phosphate is an effective and well-tolerated agent for the treatment of mild to moderate acne.³⁶ Its systemic absorption is minimal, and it is considered safe for use during all trimesters of pregnancy.^{14,17,26,27,35,37}

Erythromycin—Topical erythromycin is another commonly prescribed topical antibiotic used to target mild to moderate acne. However, its use recently has been associated with a decrease in efficacy secondary to the rise of antibacterial resistance in the community.^38-40 Nevertheless, it remains a safe treatment for use during all trimesters of pregnancy.^{14,17,26,27,35,37}

Topical Retinoids—Vitamin A derivatives (also known as retinoids) are the mainstay for the treatment of mild to moderate acne. Limited data exist regarding pregnancy outcomes after in utero exposure.⁴¹ A rare case report suggested topical tretinoin has been associated with fetal otocerebral anomalies.⁴² For tazarotene, teratogenic effects were seen in animal reproductive studies at doses exceeding maximum recommended human doses.^41,43 However, a large meta-analysis failed to find a clear risk for increased congenital malformations, spontaneous abortions, stillbirth, elective termination of pregnancy, low birthweight, or prematurity following first-trimester exposure to topical retinoids.⁴⁴ As the level of exposure that could lead to teratogenicity in humans is unknown, avoidance of both tretinoin and tazarotene is recommended in pregnant women.^41,45 Nevertheless, women inadvertently exposed should be reassured.⁴⁴

Conversely, adapalene has been associated with 1 case of anophthalmia and agenesis of the optic chiasma in a fetus following exposure until 13 weeks’ gestation.⁴⁶ However, a large, open-label trial prior to the patient transitioning from adapalene to over-the-counter treatment showed that the drug harbors a large and reassuring margin of safety and no risk for teratogenicity in a maximal usage trial and Pregnancy Safety Review.⁴⁷ Therefore, adapalene gel 0.1% is a safe and effective medication for the treatment of acne in a nonprescription environment and does not pose harm to the fetus.

Clascoterone—Clascoterone is a novel topical antiandrogenic drug approved for the treatment of hormonal and inflammatory moderate to severe acne.^48-51 Human reproductive data are limited to 1 case of pregnancy that occurred during phase 3 trial investigations, and no adverse outcomes were reported.⁵¹ Minimal systemic absorption follows topical use.⁵² Nonetheless, dose-independent malformations were reported in animal reproductive studies.⁵³ As such, it remains better to avoid the use of clascoterone during pregnancy pending further safety data.

Minocycline Foam—Minocycline foam 4% is approved to treat inflammatory lesions of nonnodular moderate to severe acne in patients 9 years and older.⁵⁴ Systemic absorption is minimal, and the drug has limited bioavailability with minimal systemic accumulation in the patient’s serum.⁵⁵ Given this information, it is unlikely that topical minocycline will reach notable levels in the fetal serum or harbor teratogenic effects, as seen with the oral formulation.⁵⁶ However, it may be best to avoid its use during the second and third trimesters given the potential risk for tooth discoloration in the fetus.^57,58

Systemic Treatments for Acne

Isotretinoin—Isotretinoin is the most effective treatment for moderate to severe acne with a well-documented potential for long-term clearance.⁵⁹ Its use during pregnancy is absolutely contraindicated, as the medication is a well-known teratogen. Associated congenital malformations include numerous craniofacial defects, cardiovascular and neurologic malformations, or thymic disorders that are estimated to affect 20% to 35% of infants exposed in utero.⁶⁰ Furthermore, strict contraception use during treatment is mandated for patients who can become pregnant. It is recommended to wait at least 1 month and 1 menstrual cycle after medication discontinuation before attempting to conceive.¹⁷ Pregnancy termination is recommended if conception occurs during treatment with isotretinoin.

Spironolactone—Spironolactone is an androgen-receptor antagonist commonly prescribed off label for mild to severe acne in females.^61,62 Spironolactone promotes the feminization of male fetuses and should be avoided in pregnancy.⁶³

Doxycycline/Minocycline—Tetracyclines are the most commonly prescribed oral antibiotics for moderate to severe acne.⁶⁴ Although highly effective at treating acne, tetracyclines generally should be avoided in pregnancy. First-trimester use of doxycycline is not absolutely contraindicated but should be reserved for severe illness and not employed for the treatment of acne. However, accidental exposure to doxycycline has not been associated with congenital malformations.⁶⁵ Nevertheless, after the 15th week of gestation, permanent tooth discoloration and bone growth inhibition in the fetus are serious and well-documented risks.^14,17 Additional adverse events following in utero exposure include infantile inguinal hernia, hypospadias, and limb hypoplasia.⁶³

Sarecycline—Sarecycline is a novel tetracycline-class antibiotic for the treatment of moderate to severe inflammatory acne. It has a narrower spectrum of activity compared to its counterparts within its class, which translates to an improved safety profile, namely when it comes to gastrointestinal tract microbiome disruption and potentially decreased likelihood of developing bacterial resistance.⁶⁶ Data on human reproductive studies are limited, but it is advisable to avoid sarecycline in pregnancy, as it may cause adverse developmental effects in the fetus, such as reduced bone growth, in addition to the well-known tetracycline-associated risk for permanent discoloration of the teeth if used during the second and third trimesters.^67,68

Erythromycin—Oral erythromycin targets moderate to severe inflammatory acne and is considered safe for use during pregnancy.^69,70 There has been 1 study reporting an increased risk for atrial and ventricular septal defects (1.8%) and pyloric stenosis (0.2%), but these risks are still uncertain, and erythromycin is considered compatible with pregnancy.⁷¹ However, erythromycin estolate formulations should be avoided given the associated 10% to 15% risk for reversible cholestatic liver injury.⁷² Erythromycin base or erythromycin ethylsuccinate formulations should be favored.

Systemic Steroids—Prednisone is indicated for severe acne with scarring and should only be used during pregnancy after clearance from the patient’s obstetrician. Doses of 0.5 mg/kg or less should be prescribed in combination with systemic antibiotics as well as agents for bone and gastrointestinal tract prophylaxis.²⁹

Zinc—The exact mechanism by which zinc exerts its effects to improve acne remains largely obscure. It has been found effective against inflammatory lesions of mild to moderate acne.⁷³ Generally recommended dosages range from 30 to 200 mg/d but may be associated with gastrointestinal tract disturbances. Dosages of 75 mg/d have shown no harm to the fetus.⁷⁴ When taking this supplement, patients should not exceed the recommended doses given the risk for hypocupremia associated with high-dose zinc supplementation.

Light-Based Therapies

Phototherapy—Narrowband UVB phototherapy is effective for the treatment of mild to moderate acne.⁷⁵ It has been proven to be a safe treatment option during pregnancy, but its use has been associated with decreased folic acid levels.^76-79 Therefore, in addition to attaining baseline folic acid serum levels, supplementation with folic acid prior to treatment, as per routine prenatal guidelines, should be sought.⁸⁰

AviClear—The AviClear (Cutera) laser is the first device cleared by the FDA for mild to severe acne in March 2022.⁸¹ The FDA clearance for the Accure (Accure Acne Inc) laser, also targeting mild to severe acne, followed soon after (November 2022). Both lasers harbor a wavelength of 1726 nm and target sebaceous glands with electrothermolysis.^82,83 Further research and long-term safety data are required before using them in pregnancy.

Other Therapies

Cosmetic Peels—Glycolic acid peels induce epidermolysis and desquamation.⁸⁴ Although data on use during pregnancy are limited, these peels have limited dermal penetration and are considered safe for use in pregnancy.^33,85,86 Similarly, keratolytic lactic acid peels harbor limited dermal penetration and can be safely used in pregnant women.^87-89 Salicylic acid peels also work through epidermolysis and desquamation⁸⁴; however, they tend to penetrate deeper into the skin, reaching down to the basal layer, if large areas are treated or when applied under occlusion.^86,90 Although their use is not contraindicated in pregnancy, they should be limited to small areas of coverage.⁹¹

Intralesional Triamcinolone—Acne cysts and inflammatory papules can be treated with intralesional triamcinolone injections to relieve acute symptoms such as pain.⁹² Low doses at concentrations of 2.5 mg/mL are considered compatible with pregnancy when indicated.²⁹

Approaching the Patient Clinical Encounter

In patients seeking treatment prior to conception, a few recommendations can be made to minimize the risk for acne recurrence or flares during pregnancy. For instance, because data show an association between increased acne severity in those with a higher body mass index and in pregnancy, weight loss may be recommended prior to pregnancy to help mitigate symptoms after conception.⁷ The Figure summarizes our recommendations for approaching and treating acne in pregnancy.

In all patients, grading the severity of the patient’s acne as mild, moderate, or severe is the first step. The presence of scarring is an additional consideration during the physical examination and should be documented. A careful discussion of treatment expectations and prognosis should be the focus before treatment initiation. Meticulous documentation of the physical examination and discussion with the patient should be prioritized.

To minimize toxicity and risks to the developing fetus, monotherapy is favored. Topical therapy should be considered first line. Safe regimens include mild nonabrasive washes, such as those containing benzoyl peroxide or glycolic acid, or topical azelaic acid or clindamycin phosphate for mild to moderate acne. More severe cases warrant the consideration of systemic medications as second line, as more severe acne is better treated with oral antibiotics such as the macrolides erythromycin or clindamycin or systemic corticosteroids when concern exists for severe scarring. The additional use of physical sunscreen also is recommended.

An important topic to address during the clinical encounter is cautious intake of oral supplements for acne during pregnancy, as they may contain harmful and teratogenic ingredients. A recent search focusing on acne supplements available online between March and May 2020 uncovered 49 different supplements, 26 (53%) of which contained vitamin A.⁹³ Importantly, 3 (6%) of these 49 supplements were likely teratogenic, 4 (8%) contained vitamin A doses exceeding the recommended daily nutritional intake level, and 15 (31%) harbored an unknown teratogenic risk. Furthermore, among the 6 (12%) supplements with vitamin A levels exceeding 10,000 IU, 2 lacked any mention of pregnancy warning, including the supplement with the highest vitamin A dose found in this study.⁹³ Because dietary supplements are not subject to the same stringent regulations by the FDA as drugs, inadvertent use by unaware patients ought to be prevented by careful counseling and education.

Finally, patients should be counseled to seek care following delivery for potentially updated medication management of acne, especially if they are breastfeeding. Co-management with a pediatrician may be indicated during lactation, particularly when newborns are born preterm or with other health conditions that may warrant additional caution with the use of certain agents.

Acne vulgaris, or acne, is a highly common inflammatory skin disorder affecting up to 85% of the population, and it constitutes the most commonly presenting chief concern in routine dermatology practice.¹ Older teenagers and young adults are most often affected by acne.² Although acne generally is more common in males, adult-onset acne occurs more frequently in women.^2,3 Black and Hispanic women are at higher risk for acne compared to those of Asian, White, or Continental Indian descent.⁴ As such, acne is a common concern in all women of childbearing age.

Concerns for maternal and fetal safety are important therapeutic considerations, especially because hormonal and physiologic changes in pregnancy can lead to onset of inflammatory acne lesions, particularly during the second and third trimesters.⁵ Female patients younger than 25 years; with a higher body mass index, prior irregular menstruation, or polycystic ovary syndrome; or those experiencing their first pregnancy are thought to be more commonly affected.^5-7 In fact, acne affects up to 43% of pregnant women, and lesions typically extend beyond the face to involve the trunk.^6,8-10 Importantly, one-third of women with a history of acne experience symptom relapse after disease-free periods, while two-thirds of those with ongoing disease experience symptom deterioration during pregnancy.¹⁰ Although acne is not a life-threatening condition, it has a well-documented, detrimental impact on social, emotional, and psychological well-being, namely self-perception, social interactions, quality-of-life scores, depression, and anxiety.¹¹

Therefore, safe and effective treatment of pregnant women is of paramount importance. Because pregnant women are not included in clinical trials, there is a paucity of medication safety data, further augmented by inefficient access to available information. The US Food and Drug Administration (FDA) pregnancy safety categories were updated in 2015, letting go of the traditional A, B, C, D, and X categories.¹² The Table reviews the current pregnancy classification system. In this narrative review, we summarize the most recent available data and recommendations on the safety and efficacy of acne treatment during pregnancy.

Topical Treatments for Acne

Benzoyl Peroxide—Benzoyl peroxide commonly is used as first-line therapy alone or in combination with other agents for the treatment of mild to moderate acne.¹³ It is safe for use during pregnancy.¹⁴ Although the medication is systemically absorbed, it undergoes complete metabolism to benzoic acid, a commonly used food additive.^15,16 Benzoic acid has low bioavailability, as it gets rapidly metabolized by the kidneys; therefore, benzoyl peroxide is unlikely to reach clinically significant levels in the maternal circulation and consequently the fetal circulation. Additionally, it has a low risk for causing congenital malformations.¹⁷

Salicylic Acid—For mild to moderate acne, salicylic acid is a second-line agent that likely is safe for use by pregnant women at low concentrations and over limited body surface areas.^14,18,19 There is minimal systemic absorption of the drug.²⁰ Additionally, aspirin, which is broken down in the body into salicylic acid, is used in low doses for the treatment of pre-eclampsia during pregnancy.²¹

Dapsone—The use of dapsone gel 5% as a second-line agent has shown efficacy for mild to moderate acne.²² The oral formulation, commonly used for malaria and leprosy prophylaxis, has failed to show associated fetal toxicity or congenital anomalies.^23,24 It also has been used as a first-line treatment for dermatitis herpetiformis in pregnancy.²⁵ Although the medication likely is safe, it is better to minimize its use during the third trimester to reduce the theoretical risk for hyperbilirubinemia in the neonate.^17,26-29

Azelaic Acid—Azelaic acid effectively targets noninflammatory and inflammatory acne and generally is well tolerated, harboring a good safety profile.³⁰ Topical 20% azelaic acid has localized antibacterial and comedolytic effects and is safe for use during pregnancy.^31,32

Glycolic Acid—Limited data exist on the safety of glycolic acid during pregnancy. In vitro studies have shown up to 27% systemic absorption depending on pH, concentration, and duration of application.³³ Animal reproductive studies involving rats have shown fetal multisystem malformations and developmental abnormalities with oral administration of glycolic acid at doses far exceeding those used in humans.³⁴ Although no human reproductive studies exist, topical glycolic acid is unlikely to reach the developing fetus in notable amounts, and the medication is likely safe for use.^17,35

Clindamycin—Topical clindamycin phosphate is an effective and well-tolerated agent for the treatment of mild to moderate acne.³⁶ Its systemic absorption is minimal, and it is considered safe for use during all trimesters of pregnancy.^{14,17,26,27,35,37}

Erythromycin—Topical erythromycin is another commonly prescribed topical antibiotic used to target mild to moderate acne. However, its use recently has been associated with a decrease in efficacy secondary to the rise of antibacterial resistance in the community.^38-40 Nevertheless, it remains a safe treatment for use during all trimesters of pregnancy.^{14,17,26,27,35,37}

Topical Retinoids—Vitamin A derivatives (also known as retinoids) are the mainstay for the treatment of mild to moderate acne. Limited data exist regarding pregnancy outcomes after in utero exposure.⁴¹ A rare case report suggested topical tretinoin has been associated with fetal otocerebral anomalies.⁴² For tazarotene, teratogenic effects were seen in animal reproductive studies at doses exceeding maximum recommended human doses.^41,43 However, a large meta-analysis failed to find a clear risk for increased congenital malformations, spontaneous abortions, stillbirth, elective termination of pregnancy, low birthweight, or prematurity following first-trimester exposure to topical retinoids.⁴⁴ As the level of exposure that could lead to teratogenicity in humans is unknown, avoidance of both tretinoin and tazarotene is recommended in pregnant women.^41,45 Nevertheless, women inadvertently exposed should be reassured.⁴⁴

Conversely, adapalene has been associated with 1 case of anophthalmia and agenesis of the optic chiasma in a fetus following exposure until 13 weeks’ gestation.⁴⁶ However, a large, open-label trial prior to the patient transitioning from adapalene to over-the-counter treatment showed that the drug harbors a large and reassuring margin of safety and no risk for teratogenicity in a maximal usage trial and Pregnancy Safety Review.⁴⁷ Therefore, adapalene gel 0.1% is a safe and effective medication for the treatment of acne in a nonprescription environment and does not pose harm to the fetus.

Clascoterone—Clascoterone is a novel topical antiandrogenic drug approved for the treatment of hormonal and inflammatory moderate to severe acne.^48-51 Human reproductive data are limited to 1 case of pregnancy that occurred during phase 3 trial investigations, and no adverse outcomes were reported.⁵¹ Minimal systemic absorption follows topical use.⁵² Nonetheless, dose-independent malformations were reported in animal reproductive studies.⁵³ As such, it remains better to avoid the use of clascoterone during pregnancy pending further safety data.

Minocycline Foam—Minocycline foam 4% is approved to treat inflammatory lesions of nonnodular moderate to severe acne in patients 9 years and older.⁵⁴ Systemic absorption is minimal, and the drug has limited bioavailability with minimal systemic accumulation in the patient’s serum.⁵⁵ Given this information, it is unlikely that topical minocycline will reach notable levels in the fetal serum or harbor teratogenic effects, as seen with the oral formulation.⁵⁶ However, it may be best to avoid its use during the second and third trimesters given the potential risk for tooth discoloration in the fetus.^57,58

Systemic Treatments for Acne

Isotretinoin—Isotretinoin is the most effective treatment for moderate to severe acne with a well-documented potential for long-term clearance.⁵⁹ Its use during pregnancy is absolutely contraindicated, as the medication is a well-known teratogen. Associated congenital malformations include numerous craniofacial defects, cardiovascular and neurologic malformations, or thymic disorders that are estimated to affect 20% to 35% of infants exposed in utero.⁶⁰ Furthermore, strict contraception use during treatment is mandated for patients who can become pregnant. It is recommended to wait at least 1 month and 1 menstrual cycle after medication discontinuation before attempting to conceive.¹⁷ Pregnancy termination is recommended if conception occurs during treatment with isotretinoin.

Spironolactone—Spironolactone is an androgen-receptor antagonist commonly prescribed off label for mild to severe acne in females.^61,62 Spironolactone promotes the feminization of male fetuses and should be avoided in pregnancy.⁶³

Doxycycline/Minocycline—Tetracyclines are the most commonly prescribed oral antibiotics for moderate to severe acne.⁶⁴ Although highly effective at treating acne, tetracyclines generally should be avoided in pregnancy. First-trimester use of doxycycline is not absolutely contraindicated but should be reserved for severe illness and not employed for the treatment of acne. However, accidental exposure to doxycycline has not been associated with congenital malformations.⁶⁵ Nevertheless, after the 15th week of gestation, permanent tooth discoloration and bone growth inhibition in the fetus are serious and well-documented risks.^14,17 Additional adverse events following in utero exposure include infantile inguinal hernia, hypospadias, and limb hypoplasia.⁶³

Sarecycline—Sarecycline is a novel tetracycline-class antibiotic for the treatment of moderate to severe inflammatory acne. It has a narrower spectrum of activity compared to its counterparts within its class, which translates to an improved safety profile, namely when it comes to gastrointestinal tract microbiome disruption and potentially decreased likelihood of developing bacterial resistance.⁶⁶ Data on human reproductive studies are limited, but it is advisable to avoid sarecycline in pregnancy, as it may cause adverse developmental effects in the fetus, such as reduced bone growth, in addition to the well-known tetracycline-associated risk for permanent discoloration of the teeth if used during the second and third trimesters.^67,68

Erythromycin—Oral erythromycin targets moderate to severe inflammatory acne and is considered safe for use during pregnancy.^69,70 There has been 1 study reporting an increased risk for atrial and ventricular septal defects (1.8%) and pyloric stenosis (0.2%), but these risks are still uncertain, and erythromycin is considered compatible with pregnancy.⁷¹ However, erythromycin estolate formulations should be avoided given the associated 10% to 15% risk for reversible cholestatic liver injury.⁷² Erythromycin base or erythromycin ethylsuccinate formulations should be favored.

Systemic Steroids—Prednisone is indicated for severe acne with scarring and should only be used during pregnancy after clearance from the patient’s obstetrician. Doses of 0.5 mg/kg or less should be prescribed in combination with systemic antibiotics as well as agents for bone and gastrointestinal tract prophylaxis.²⁹

Zinc—The exact mechanism by which zinc exerts its effects to improve acne remains largely obscure. It has been found effective against inflammatory lesions of mild to moderate acne.⁷³ Generally recommended dosages range from 30 to 200 mg/d but may be associated with gastrointestinal tract disturbances. Dosages of 75 mg/d have shown no harm to the fetus.⁷⁴ When taking this supplement, patients should not exceed the recommended doses given the risk for hypocupremia associated with high-dose zinc supplementation.

Light-Based Therapies

Phototherapy—Narrowband UVB phototherapy is effective for the treatment of mild to moderate acne.⁷⁵ It has been proven to be a safe treatment option during pregnancy, but its use has been associated with decreased folic acid levels.^76-79 Therefore, in addition to attaining baseline folic acid serum levels, supplementation with folic acid prior to treatment, as per routine prenatal guidelines, should be sought.⁸⁰

AviClear—The AviClear (Cutera) laser is the first device cleared by the FDA for mild to severe acne in March 2022.⁸¹ The FDA clearance for the Accure (Accure Acne Inc) laser, also targeting mild to severe acne, followed soon after (November 2022). Both lasers harbor a wavelength of 1726 nm and target sebaceous glands with electrothermolysis.^82,83 Further research and long-term safety data are required before using them in pregnancy.

Other Therapies

Cosmetic Peels—Glycolic acid peels induce epidermolysis and desquamation.⁸⁴ Although data on use during pregnancy are limited, these peels have limited dermal penetration and are considered safe for use in pregnancy.^33,85,86 Similarly, keratolytic lactic acid peels harbor limited dermal penetration and can be safely used in pregnant women.^87-89 Salicylic acid peels also work through epidermolysis and desquamation⁸⁴; however, they tend to penetrate deeper into the skin, reaching down to the basal layer, if large areas are treated or when applied under occlusion.^86,90 Although their use is not contraindicated in pregnancy, they should be limited to small areas of coverage.⁹¹

Intralesional Triamcinolone—Acne cysts and inflammatory papules can be treated with intralesional triamcinolone injections to relieve acute symptoms such as pain.⁹² Low doses at concentrations of 2.5 mg/mL are considered compatible with pregnancy when indicated.²⁹

Approaching the Patient Clinical Encounter

In patients seeking treatment prior to conception, a few recommendations can be made to minimize the risk for acne recurrence or flares during pregnancy. For instance, because data show an association between increased acne severity in those with a higher body mass index and in pregnancy, weight loss may be recommended prior to pregnancy to help mitigate symptoms after conception.⁷ The Figure summarizes our recommendations for approaching and treating acne in pregnancy.

In all patients, grading the severity of the patient’s acne as mild, moderate, or severe is the first step. The presence of scarring is an additional consideration during the physical examination and should be documented. A careful discussion of treatment expectations and prognosis should be the focus before treatment initiation. Meticulous documentation of the physical examination and discussion with the patient should be prioritized.

To minimize toxicity and risks to the developing fetus, monotherapy is favored. Topical therapy should be considered first line. Safe regimens include mild nonabrasive washes, such as those containing benzoyl peroxide or glycolic acid, or topical azelaic acid or clindamycin phosphate for mild to moderate acne. More severe cases warrant the consideration of systemic medications as second line, as more severe acne is better treated with oral antibiotics such as the macrolides erythromycin or clindamycin or systemic corticosteroids when concern exists for severe scarring. The additional use of physical sunscreen also is recommended.

An important topic to address during the clinical encounter is cautious intake of oral supplements for acne during pregnancy, as they may contain harmful and teratogenic ingredients. A recent search focusing on acne supplements available online between March and May 2020 uncovered 49 different supplements, 26 (53%) of which contained vitamin A.⁹³ Importantly, 3 (6%) of these 49 supplements were likely teratogenic, 4 (8%) contained vitamin A doses exceeding the recommended daily nutritional intake level, and 15 (31%) harbored an unknown teratogenic risk. Furthermore, among the 6 (12%) supplements with vitamin A levels exceeding 10,000 IU, 2 lacked any mention of pregnancy warning, including the supplement with the highest vitamin A dose found in this study.⁹³ Because dietary supplements are not subject to the same stringent regulations by the FDA as drugs, inadvertent use by unaware patients ought to be prevented by careful counseling and education.

Finally, patients should be counseled to seek care following delivery for potentially updated medication management of acne, especially if they are breastfeeding. Co-management with a pediatrician may be indicated during lactation, particularly when newborns are born preterm or with other health conditions that may warrant additional caution with the use of certain agents.

To the Editor:

Partial or total nail plate excisions commonly are used for the treatment of onychocryptosis and nail spicules. Procedures involving the nail unit require advanced technical skills to achieve optimal functional and aesthetic outcomes, avoid complications, and minimize health care costs. Data on the frequency of nail plate excisions performed by dermatologists and their relative frequency compared to other medical providers are limited. The objective of our study was to analyze trends in nail excision practice patterns among medical providers in the United States.

A retrospective analysis on nail excisions using the Current Procedural Terminology (CPT) code 11750 (excision of nail and nail matrix, partial or complete [eg, ingrown or deformed nail] for permanent removal), which is distinct from code 11755 (biopsy of nail unit [eg, plate, bed, matrix, hyponychium, proximal and lateral nail folds][separate procedure]), was performed using data from the Medicare Provider Utilization and Payment Database 2012-2017.^1,2 This file also is used by Peck et al³ in an article submitted to the Journal of the American Podiatric Medical Association and currently under consideration for publication. Procedures were recorded by year and provider type—dermatologist, podiatrist, physician assistant (PA)/nurse practitioner (NP), nondermatologist physician—and subcategorized by provider specialty (Table). Practice locations subcategorized by provider type were mapped using Tableau Software (Salesforce)(Figure). Descriptive statistics including number of providers, mean and median excisions per provider, and minimum/maximum nail excisions were calculated (Table). Practice types of PAs/NPs and specialization of nondermatologist physicians were determined using provider name, identification number, and practice address. This study did not require institutional review board review, as only publicly available data were utilized in our analysis.

A total of 6936 podiatrists, 58 nondermatologist physicians, 25 PAs/NPs, and 4 dermatologists performed 10 or more nail excisions annually under CPT code 11750 from January 2012 to December 2017 with annual means of 31, 31, 25, and 34, respectively (Table). No PAs/NPs included in the dataset worked in dermatology practices during the study period. Physician assistants and NPs most often practiced in podiatry and family medicine (FM) settings (both 40% [10/25]). Nondermatologist physicians most often specialized in FM (40% [23/58])(Table). The greatest number of providers practiced in 3 of the 4 most-populous states: California, Texas, and Florida; the fewest number practiced in 3 of the 10 least-populous states: Alaska, Hawaii, and Vermont. Vermont, Wyoming, and North Dakota—3 of the 5 least-populous states—had the fewest practitioners among the contiguous United States (Figure).

Figure generated using Tableau, which integrates with Mapbox. © Mapbox (https://www.mapbox.com/about/maps/), © OpenStreetMap (http://www.openstreetmap.org/copyright).

Our study showed that from January 2012 to December 2017, fewer dermatologists performed nail excisions than any other provider type (0.06%, 4 dermatologists of 7023 total providers), and dermatologists performed 1734-fold fewer nail excisions than podiatrists (99%, 6936 podiatrists of 7023 total providers). Only dermatologists practicing in California, Georgia, Indiana, and Oklahoma performed nail excisions. Conversely, podiatrists were more geographically distributed across the United States and other territories, with representation in all 50 states as well as the District of Columbia, Puerto Rico, and Guam.

Reasons for these large discrepancies in practice between dermatologists and other providers likely are multifactorial, encompassing a lack of emphasis on nail procedures in dermatology training, patient perception of the scope of dermatologic practice, and nail excision reimbursement patterns. Most dermatologists likely lack experience in performing nail procedures. The Accreditation Council for Graduate Medical Education requirements mandate that dermatology residents observe or perform 3 nail procedures over 3 years of residency, including 1 that may be performed on a human cadaver.⁴ In contrast, podiatry trainees must gain competency in toenail avulsion (both partial and complete), participate in anesthesia workshops, and become proficient in administering lower extremity blocks by the end of their training.⁵ Therefore, incorporating aspects of podiatric surgical training into dermatology residency requirements may increase the competency and comfort of dermatologists in performing nail excisions and practicing as nail experts as attending physicians.

It is likely that US patients do not perceive dermatologists as nail specialists and instead primarily consult podiatrists or FM and/or internal medicine physicians for treatment; for example, nail disease was one of the least common reasons for consulting a dermatologist (5%) in a German nationwide survey-based study (N=1015).⁶ Therefore, increased efforts are needed to educate the general public about the expertise of dermatologists in the diagnosis and management of nail conditions.

Reimbursement also may be a barrier to dermatologists performing nail procedures as part of their scope of practice; for example, in a retrospective study of nail biopsies using the Medicare Provider Utilization and Payment Database, there was no statistically significant difference in reimbursements for nail biopsies vs skin biopsies from 2012 to 2017 (P=0.69).⁷ Similar to nail biopsies, nail excisions typically are much more time consuming and technically demanding than skin biopsies, which may discourage dermatologists from routinely performing nail excision procedures.

Our study is subject to a number of limitations. The data reflected only US-based practice patterns and may not be applicable to nail procedures globally. There also is the potential for miscoding of procedures in the Medicare database. The data included only Part B Medicare fee-for-service and excludes non-Medicare insured, uninsured, and self-pay patients, as well as aggregated records from 10 or fewer Medicare beneficiaries.

Dermatologists rarely perform nail excisions and perform fewer nail excisions than any other provider type in the United States. There currently is an unmet need for comprehensive nail surgery education in US-based dermatology residency programs. We hope that our study fosters interdisciplinary collegiality and training between podiatrists and dermatologists and promotes expanded access to care across the United States to serve patients with nail disorders.

To the Editor:

Partial or total nail plate excisions commonly are used for the treatment of onychocryptosis and nail spicules. Procedures involving the nail unit require advanced technical skills to achieve optimal functional and aesthetic outcomes, avoid complications, and minimize health care costs. Data on the frequency of nail plate excisions performed by dermatologists and their relative frequency compared to other medical providers are limited. The objective of our study was to analyze trends in nail excision practice patterns among medical providers in the United States.

A retrospective analysis on nail excisions using the Current Procedural Terminology (CPT) code 11750 (excision of nail and nail matrix, partial or complete [eg, ingrown or deformed nail] for permanent removal), which is distinct from code 11755 (biopsy of nail unit [eg, plate, bed, matrix, hyponychium, proximal and lateral nail folds][separate procedure]), was performed using data from the Medicare Provider Utilization and Payment Database 2012-2017.^1,2 This file also is used by Peck et al³ in an article submitted to the Journal of the American Podiatric Medical Association and currently under consideration for publication. Procedures were recorded by year and provider type—dermatologist, podiatrist, physician assistant (PA)/nurse practitioner (NP), nondermatologist physician—and subcategorized by provider specialty (Table). Practice locations subcategorized by provider type were mapped using Tableau Software (Salesforce)(Figure). Descriptive statistics including number of providers, mean and median excisions per provider, and minimum/maximum nail excisions were calculated (Table). Practice types of PAs/NPs and specialization of nondermatologist physicians were determined using provider name, identification number, and practice address. This study did not require institutional review board review, as only publicly available data were utilized in our analysis.

A total of 6936 podiatrists, 58 nondermatologist physicians, 25 PAs/NPs, and 4 dermatologists performed 10 or more nail excisions annually under CPT code 11750 from January 2012 to December 2017 with annual means of 31, 31, 25, and 34, respectively (Table). No PAs/NPs included in the dataset worked in dermatology practices during the study period. Physician assistants and NPs most often practiced in podiatry and family medicine (FM) settings (both 40% [10/25]). Nondermatologist physicians most often specialized in FM (40% [23/58])(Table). The greatest number of providers practiced in 3 of the 4 most-populous states: California, Texas, and Florida; the fewest number practiced in 3 of the 10 least-populous states: Alaska, Hawaii, and Vermont. Vermont, Wyoming, and North Dakota—3 of the 5 least-populous states—had the fewest practitioners among the contiguous United States (Figure).

Figure generated using Tableau, which integrates with Mapbox. © Mapbox (https://www.mapbox.com/about/maps/), © OpenStreetMap (http://www.openstreetmap.org/copyright).

Our study showed that from January 2012 to December 2017, fewer dermatologists performed nail excisions than any other provider type (0.06%, 4 dermatologists of 7023 total providers), and dermatologists performed 1734-fold fewer nail excisions than podiatrists (99%, 6936 podiatrists of 7023 total providers). Only dermatologists practicing in California, Georgia, Indiana, and Oklahoma performed nail excisions. Conversely, podiatrists were more geographically distributed across the United States and other territories, with representation in all 50 states as well as the District of Columbia, Puerto Rico, and Guam.

Reasons for these large discrepancies in practice between dermatologists and other providers likely are multifactorial, encompassing a lack of emphasis on nail procedures in dermatology training, patient perception of the scope of dermatologic practice, and nail excision reimbursement patterns. Most dermatologists likely lack experience in performing nail procedures. The Accreditation Council for Graduate Medical Education requirements mandate that dermatology residents observe or perform 3 nail procedures over 3 years of residency, including 1 that may be performed on a human cadaver.⁴ In contrast, podiatry trainees must gain competency in toenail avulsion (both partial and complete), participate in anesthesia workshops, and become proficient in administering lower extremity blocks by the end of their training.⁵ Therefore, incorporating aspects of podiatric surgical training into dermatology residency requirements may increase the competency and comfort of dermatologists in performing nail excisions and practicing as nail experts as attending physicians.

It is likely that US patients do not perceive dermatologists as nail specialists and instead primarily consult podiatrists or FM and/or internal medicine physicians for treatment; for example, nail disease was one of the least common reasons for consulting a dermatologist (5%) in a German nationwide survey-based study (N=1015).⁶ Therefore, increased efforts are needed to educate the general public about the expertise of dermatologists in the diagnosis and management of nail conditions.

Reimbursement also may be a barrier to dermatologists performing nail procedures as part of their scope of practice; for example, in a retrospective study of nail biopsies using the Medicare Provider Utilization and Payment Database, there was no statistically significant difference in reimbursements for nail biopsies vs skin biopsies from 2012 to 2017 (P=0.69).⁷ Similar to nail biopsies, nail excisions typically are much more time consuming and technically demanding than skin biopsies, which may discourage dermatologists from routinely performing nail excision procedures.

Our study is subject to a number of limitations. The data reflected only US-based practice patterns and may not be applicable to nail procedures globally. There also is the potential for miscoding of procedures in the Medicare database. The data included only Part B Medicare fee-for-service and excludes non-Medicare insured, uninsured, and self-pay patients, as well as aggregated records from 10 or fewer Medicare beneficiaries.

Dermatologists rarely perform nail excisions and perform fewer nail excisions than any other provider type in the United States. There currently is an unmet need for comprehensive nail surgery education in US-based dermatology residency programs. We hope that our study fosters interdisciplinary collegiality and training between podiatrists and dermatologists and promotes expanded access to care across the United States to serve patients with nail disorders.

To the Editor:

Partial or total nail plate excisions commonly are used for the treatment of onychocryptosis and nail spicules. Procedures involving the nail unit require advanced technical skills to achieve optimal functional and aesthetic outcomes, avoid complications, and minimize health care costs. Data on the frequency of nail plate excisions performed by dermatologists and their relative frequency compared to other medical providers are limited. The objective of our study was to analyze trends in nail excision practice patterns among medical providers in the United States.

A retrospective analysis on nail excisions using the Current Procedural Terminology (CPT) code 11750 (excision of nail and nail matrix, partial or complete [eg, ingrown or deformed nail] for permanent removal), which is distinct from code 11755 (biopsy of nail unit [eg, plate, bed, matrix, hyponychium, proximal and lateral nail folds][separate procedure]), was performed using data from the Medicare Provider Utilization and Payment Database 2012-2017.^1,2 This file also is used by Peck et al³ in an article submitted to the Journal of the American Podiatric Medical Association and currently under consideration for publication. Procedures were recorded by year and provider type—dermatologist, podiatrist, physician assistant (PA)/nurse practitioner (NP), nondermatologist physician—and subcategorized by provider specialty (Table). Practice locations subcategorized by provider type were mapped using Tableau Software (Salesforce)(Figure). Descriptive statistics including number of providers, mean and median excisions per provider, and minimum/maximum nail excisions were calculated (Table). Practice types of PAs/NPs and specialization of nondermatologist physicians were determined using provider name, identification number, and practice address. This study did not require institutional review board review, as only publicly available data were utilized in our analysis.

A total of 6936 podiatrists, 58 nondermatologist physicians, 25 PAs/NPs, and 4 dermatologists performed 10 or more nail excisions annually under CPT code 11750 from January 2012 to December 2017 with annual means of 31, 31, 25, and 34, respectively (Table). No PAs/NPs included in the dataset worked in dermatology practices during the study period. Physician assistants and NPs most often practiced in podiatry and family medicine (FM) settings (both 40% [10/25]). Nondermatologist physicians most often specialized in FM (40% [23/58])(Table). The greatest number of providers practiced in 3 of the 4 most-populous states: California, Texas, and Florida; the fewest number practiced in 3 of the 10 least-populous states: Alaska, Hawaii, and Vermont. Vermont, Wyoming, and North Dakota—3 of the 5 least-populous states—had the fewest practitioners among the contiguous United States (Figure).

Figure generated using Tableau, which integrates with Mapbox. © Mapbox (https://www.mapbox.com/about/maps/), © OpenStreetMap (http://www.openstreetmap.org/copyright).

Our study showed that from January 2012 to December 2017, fewer dermatologists performed nail excisions than any other provider type (0.06%, 4 dermatologists of 7023 total providers), and dermatologists performed 1734-fold fewer nail excisions than podiatrists (99%, 6936 podiatrists of 7023 total providers). Only dermatologists practicing in California, Georgia, Indiana, and Oklahoma performed nail excisions. Conversely, podiatrists were more geographically distributed across the United States and other territories, with representation in all 50 states as well as the District of Columbia, Puerto Rico, and Guam.

Reasons for these large discrepancies in practice between dermatologists and other providers likely are multifactorial, encompassing a lack of emphasis on nail procedures in dermatology training, patient perception of the scope of dermatologic practice, and nail excision reimbursement patterns. Most dermatologists likely lack experience in performing nail procedures. The Accreditation Council for Graduate Medical Education requirements mandate that dermatology residents observe or perform 3 nail procedures over 3 years of residency, including 1 that may be performed on a human cadaver.⁴ In contrast, podiatry trainees must gain competency in toenail avulsion (both partial and complete), participate in anesthesia workshops, and become proficient in administering lower extremity blocks by the end of their training.⁵ Therefore, incorporating aspects of podiatric surgical training into dermatology residency requirements may increase the competency and comfort of dermatologists in performing nail excisions and practicing as nail experts as attending physicians.

It is likely that US patients do not perceive dermatologists as nail specialists and instead primarily consult podiatrists or FM and/or internal medicine physicians for treatment; for example, nail disease was one of the least common reasons for consulting a dermatologist (5%) in a German nationwide survey-based study (N=1015).⁶ Therefore, increased efforts are needed to educate the general public about the expertise of dermatologists in the diagnosis and management of nail conditions.

Reimbursement also may be a barrier to dermatologists performing nail procedures as part of their scope of practice; for example, in a retrospective study of nail biopsies using the Medicare Provider Utilization and Payment Database, there was no statistically significant difference in reimbursements for nail biopsies vs skin biopsies from 2012 to 2017 (P=0.69).⁷ Similar to nail biopsies, nail excisions typically are much more time consuming and technically demanding than skin biopsies, which may discourage dermatologists from routinely performing nail excision procedures.

Our study is subject to a number of limitations. The data reflected only US-based practice patterns and may not be applicable to nail procedures globally. There also is the potential for miscoding of procedures in the Medicare database. The data included only Part B Medicare fee-for-service and excludes non-Medicare insured, uninsured, and self-pay patients, as well as aggregated records from 10 or fewer Medicare beneficiaries.

Dermatologists rarely perform nail excisions and perform fewer nail excisions than any other provider type in the United States. There currently is an unmet need for comprehensive nail surgery education in US-based dermatology residency programs. We hope that our study fosters interdisciplinary collegiality and training between podiatrists and dermatologists and promotes expanded access to care across the United States to serve patients with nail disorders.

The Diagnosis: Argyria-Induced Azure Lunulae

Argyria is an acquired condition resulting from excessive exogenous exposure to silver with subsequent gastrointestinal absorption and pigmentary tissue deposition. Upon further questioning, our patient disclosed a lifetime history of colloidal silver use, both as a topical antiseptic agent and intraorally for aphthous ulcers. Silver has a predilection for granular deposition in stromal tissues and basement membranes with sparing of the epidermis, manifesting as progressive, permanent, blue to slate gray discoloration of sunexposed skin, mucous membranes, and nail beds.¹ The patient was advised to discontinue use of colloidal silver to avoid development of further pigmentary changes. The appearance of his nails remained unchanged in the months following initial presentation, as expected, since argyria pigmentation is not anticipated to reverse upon colloidal silver cessation.

Nail involvement may be an early presentation of generalized argyria or may be found in isolation, as seen in our patient. Early recognition and patient education are essential to minimize cumulative silver deposition. Although dyspigmentation may impact psychosocial well-being secondary to aesthetic concerns, there is limited research supporting adverse systemic effects of argyria confined to the nail beds. Similarly, the majority of generalized cases are not associated with systemic complications; however, potential toxicities, as described in isolated case reports without conclusive causal relationships, include nyctalopia, renal or hepatic toxicity, pulmonary fibrosis, and neuropsychiatric events.^1-6 Successful treatment of cutaneous argyria has been reported with the 1064-nm Q-switched Nd:YAG laser; however, there have been no reported treatments for nail bed involvement.⁷ Due to the absence of systemic symptoms, additional mucocutaneous dyspigmentation, or cosmetic concerns regarding nail bed lunulae discoloration in our patient, no further intervention was pursued, except for continued colloidal silver cessation.

The differential diagnosis of blue-gray nail bed dyspigmentation is broad and includes cyanosis secondary to cardiopulmonary disease, drug-induced dyspigmentation, Wilson disease, argyria, chrysiasis, hereditary acrolabial telangiectasia, and pseudomonal infection or chloronychia.^1,8,9 Etiologic insight may be provided from a thorough review of prescription and over-the-counter medications as well as careful attention to the distribution of dyspigmentation. Medications commonly associated with bluish nail bed dyspigmentation include antimalarials, amiodarone, minocycline, clofazimine, chlorpromazine/phenothiazines, and various chemotherapeutic drugs; our patient was not taking any of these.^1,9

Cyanotic nail bed dyspigmentation secondary to cardiopulmonary disease likely manifests with more diffuse nail bed dyspigmentation and is not confined solely to the lunulae. Only drug-induced dyspigmentation, classically due to phenolphthalein-containing laxatives; Wilson disease; and argyria have a tendency to spare the distal nail bed, which is a presentation termed azure lunulae.⁸ The toenails typically are spared in argyria, while toenail involvement is variable in Wilson disease, and additional systemic symptoms—including hepatic, ophthalmologic, and neuropsychiatric—as well as potential family history would be expected.⁸ Phenolphthalein is no longer available in over-the-counter laxatives, as it was formally banned by the US Food and Drug Administration in 1999 due to concerns of carcinogenicity.¹⁰

Hereditary acrolabial telangiectasia is a familial condition with autosomal-dominant inheritance that can manifest similarly to argyria with blue-gray discoloration of the proximal nail bed; however, this condition also would demonstrate involvement of the vermilion border and nipple areolae, often with associated telangiectasia and migraine headaches.¹¹

Chloronychia (also known as green nail syndrome) is an infection of the nail bed with Pseudomonas aeruginosa that more commonly presents with greenblack discoloration with variable involvement of the fingernails and toenails. Chloronychia, often with associated onycholysis, typically is found in individuals with repeated exposure to water, soaps, and detergents.¹² Our patient’s long-standing and unwavering nail bed appearance, involvement of all fingernail lunulae, lack of additional symptoms, and disclosed use of over-the-counter colloidal silver supported a clinical diagnosis of argyriainduced azure lunulae.

Argyria-induced azure lunulae secondary to colloidal silver exposure is an uncommon yet clinically significant cause of nail bed dyspigmentation. Prompt identification and cessation of the offending agent can prevent progression of mucocutaneous dyspigmentation and avoid potential long-term sequelae from systemic deposition.

The Diagnosis: Argyria-Induced Azure Lunulae

Argyria is an acquired condition resulting from excessive exogenous exposure to silver with subsequent gastrointestinal absorption and pigmentary tissue deposition. Upon further questioning, our patient disclosed a lifetime history of colloidal silver use, both as a topical antiseptic agent and intraorally for aphthous ulcers. Silver has a predilection for granular deposition in stromal tissues and basement membranes with sparing of the epidermis, manifesting as progressive, permanent, blue to slate gray discoloration of sunexposed skin, mucous membranes, and nail beds.¹ The patient was advised to discontinue use of colloidal silver to avoid development of further pigmentary changes. The appearance of his nails remained unchanged in the months following initial presentation, as expected, since argyria pigmentation is not anticipated to reverse upon colloidal silver cessation.

Nail involvement may be an early presentation of generalized argyria or may be found in isolation, as seen in our patient. Early recognition and patient education are essential to minimize cumulative silver deposition. Although dyspigmentation may impact psychosocial well-being secondary to aesthetic concerns, there is limited research supporting adverse systemic effects of argyria confined to the nail beds. Similarly, the majority of generalized cases are not associated with systemic complications; however, potential toxicities, as described in isolated case reports without conclusive causal relationships, include nyctalopia, renal or hepatic toxicity, pulmonary fibrosis, and neuropsychiatric events.^1-6 Successful treatment of cutaneous argyria has been reported with the 1064-nm Q-switched Nd:YAG laser; however, there have been no reported treatments for nail bed involvement.⁷ Due to the absence of systemic symptoms, additional mucocutaneous dyspigmentation, or cosmetic concerns regarding nail bed lunulae discoloration in our patient, no further intervention was pursued, except for continued colloidal silver cessation.

The differential diagnosis of blue-gray nail bed dyspigmentation is broad and includes cyanosis secondary to cardiopulmonary disease, drug-induced dyspigmentation, Wilson disease, argyria, chrysiasis, hereditary acrolabial telangiectasia, and pseudomonal infection or chloronychia.^1,8,9 Etiologic insight may be provided from a thorough review of prescription and over-the-counter medications as well as careful attention to the distribution of dyspigmentation. Medications commonly associated with bluish nail bed dyspigmentation include antimalarials, amiodarone, minocycline, clofazimine, chlorpromazine/phenothiazines, and various chemotherapeutic drugs; our patient was not taking any of these.^1,9

Cyanotic nail bed dyspigmentation secondary to cardiopulmonary disease likely manifests with more diffuse nail bed dyspigmentation and is not confined solely to the lunulae. Only drug-induced dyspigmentation, classically due to phenolphthalein-containing laxatives; Wilson disease; and argyria have a tendency to spare the distal nail bed, which is a presentation termed azure lunulae.⁸ The toenails typically are spared in argyria, while toenail involvement is variable in Wilson disease, and additional systemic symptoms—including hepatic, ophthalmologic, and neuropsychiatric—as well as potential family history would be expected.⁸ Phenolphthalein is no longer available in over-the-counter laxatives, as it was formally banned by the US Food and Drug Administration in 1999 due to concerns of carcinogenicity.¹⁰

Hereditary acrolabial telangiectasia is a familial condition with autosomal-dominant inheritance that can manifest similarly to argyria with blue-gray discoloration of the proximal nail bed; however, this condition also would demonstrate involvement of the vermilion border and nipple areolae, often with associated telangiectasia and migraine headaches.¹¹

Chloronychia (also known as green nail syndrome) is an infection of the nail bed with Pseudomonas aeruginosa that more commonly presents with greenblack discoloration with variable involvement of the fingernails and toenails. Chloronychia, often with associated onycholysis, typically is found in individuals with repeated exposure to water, soaps, and detergents.¹² Our patient’s long-standing and unwavering nail bed appearance, involvement of all fingernail lunulae, lack of additional symptoms, and disclosed use of over-the-counter colloidal silver supported a clinical diagnosis of argyriainduced azure lunulae.

Argyria-induced azure lunulae secondary to colloidal silver exposure is an uncommon yet clinically significant cause of nail bed dyspigmentation. Prompt identification and cessation of the offending agent can prevent progression of mucocutaneous dyspigmentation and avoid potential long-term sequelae from systemic deposition.

The Diagnosis: Argyria-Induced Azure Lunulae

Argyria is an acquired condition resulting from excessive exogenous exposure to silver with subsequent gastrointestinal absorption and pigmentary tissue deposition. Upon further questioning, our patient disclosed a lifetime history of colloidal silver use, both as a topical antiseptic agent and intraorally for aphthous ulcers. Silver has a predilection for granular deposition in stromal tissues and basement membranes with sparing of the epidermis, manifesting as progressive, permanent, blue to slate gray discoloration of sunexposed skin, mucous membranes, and nail beds.¹ The patient was advised to discontinue use of colloidal silver to avoid development of further pigmentary changes. The appearance of his nails remained unchanged in the months following initial presentation, as expected, since argyria pigmentation is not anticipated to reverse upon colloidal silver cessation.

Nail involvement may be an early presentation of generalized argyria or may be found in isolation, as seen in our patient. Early recognition and patient education are essential to minimize cumulative silver deposition. Although dyspigmentation may impact psychosocial well-being secondary to aesthetic concerns, there is limited research supporting adverse systemic effects of argyria confined to the nail beds. Similarly, the majority of generalized cases are not associated with systemic complications; however, potential toxicities, as described in isolated case reports without conclusive causal relationships, include nyctalopia, renal or hepatic toxicity, pulmonary fibrosis, and neuropsychiatric events.^1-6 Successful treatment of cutaneous argyria has been reported with the 1064-nm Q-switched Nd:YAG laser; however, there have been no reported treatments for nail bed involvement.⁷ Due to the absence of systemic symptoms, additional mucocutaneous dyspigmentation, or cosmetic concerns regarding nail bed lunulae discoloration in our patient, no further intervention was pursued, except for continued colloidal silver cessation.

The differential diagnosis of blue-gray nail bed dyspigmentation is broad and includes cyanosis secondary to cardiopulmonary disease, drug-induced dyspigmentation, Wilson disease, argyria, chrysiasis, hereditary acrolabial telangiectasia, and pseudomonal infection or chloronychia.^1,8,9 Etiologic insight may be provided from a thorough review of prescription and over-the-counter medications as well as careful attention to the distribution of dyspigmentation. Medications commonly associated with bluish nail bed dyspigmentation include antimalarials, amiodarone, minocycline, clofazimine, chlorpromazine/phenothiazines, and various chemotherapeutic drugs; our patient was not taking any of these.^1,9

Cyanotic nail bed dyspigmentation secondary to cardiopulmonary disease likely manifests with more diffuse nail bed dyspigmentation and is not confined solely to the lunulae. Only drug-induced dyspigmentation, classically due to phenolphthalein-containing laxatives; Wilson disease; and argyria have a tendency to spare the distal nail bed, which is a presentation termed azure lunulae.⁸ The toenails typically are spared in argyria, while toenail involvement is variable in Wilson disease, and additional systemic symptoms—including hepatic, ophthalmologic, and neuropsychiatric—as well as potential family history would be expected.⁸ Phenolphthalein is no longer available in over-the-counter laxatives, as it was formally banned by the US Food and Drug Administration in 1999 due to concerns of carcinogenicity.¹⁰

Hereditary acrolabial telangiectasia is a familial condition with autosomal-dominant inheritance that can manifest similarly to argyria with blue-gray discoloration of the proximal nail bed; however, this condition also would demonstrate involvement of the vermilion border and nipple areolae, often with associated telangiectasia and migraine headaches.¹¹

Chloronychia (also known as green nail syndrome) is an infection of the nail bed with Pseudomonas aeruginosa that more commonly presents with greenblack discoloration with variable involvement of the fingernails and toenails. Chloronychia, often with associated onycholysis, typically is found in individuals with repeated exposure to water, soaps, and detergents.¹² Our patient’s long-standing and unwavering nail bed appearance, involvement of all fingernail lunulae, lack of additional symptoms, and disclosed use of over-the-counter colloidal silver supported a clinical diagnosis of argyriainduced azure lunulae.

Argyria-induced azure lunulae secondary to colloidal silver exposure is an uncommon yet clinically significant cause of nail bed dyspigmentation. Prompt identification and cessation of the offending agent can prevent progression of mucocutaneous dyspigmentation and avoid potential long-term sequelae from systemic deposition.

To the Editor:

Cutaneous cysts commonly are treated by dermatologists and typically are diagnosed clinically, followed by intraoperative or histologic confirmation; however, cyst mimickers can be misdiagnosed due to similar appearance and limited diagnostic guidelines.¹ Vascular anomalies (VAs) of the face such as a facial aneurysm are rare.² Preoperative assessment of findings suggestive of vascular etiology vs other common cutaneous tumors such as an epidermal inclusion cyst (EIC) and lipoma can help guide dermatologic management. We present a case of a VA of the glabella manifesting as a flesh-colored nodule that clinically mimicked a cyst and discuss the subsequent surgical management.

A 61-year-old man with a history of benign prostatic hyperplasia was evaluated at our dermatology clinic for an enlarging forehead mass of 1 year’s duration. Physical examination yielded a soft, flesh-colored, 2.5-cm nodule located superficially in the midline glabellar region without pulsation or palpable thrill. The differential diagnosis at the time included lipoma or EIC.

Excision of the lesion was performed utilizing superficial incisions with a descending depth of 1-mm increments to safely reach the target, identify the type of tumor, and prevent rupture of the suspected EIC. After the third incision to the level of the dermis, nonpulsatile bleeding was more than expected for a cyst. Digital pressure was applied, and the area was explored with blunt dissection to identify the source of bleeding. A fusiform, thin-walled aneurysm was identified in the dermal plane with additional tributaries coursing deep into the subcutaneous plane. The visualized tributaries were ligated with 3-0 polyglactin, figure-of-eight sutures resulting in hemostasis. The wound was closed with 5-0 nylon simple interrupted sutures. The patient was closely followed postoperatively for 1 week (Figure) and was referred for head imaging to evaluate for a possible associated intracranial aneurysm. Based on the thin vessel wall and continuous nonpulsatile hemorrhage, this VA was most consistent with venous aneurysm.

A VA can be encountered unexpectedly during dermatologic surgery. An aneurysm is a type of VA and is defined as an abnormal dilatation of a blood vessel that can be arterial, venous, or an arteriovenous malformation. Most reported aneurysms of the head and neck are cirsoid aneurysms or involve the superficial temporal artery.^2,3 Reports of superficial venous aneurysms are rare.⁴ Preoperatively, cutaneous nodules can be evaluated for findings suggestive of a VA in the dermatologist’s office through physical examination. Arterial aneurysms may reveal palpable pulsation and audible bruit, while a venous aneurysm may exhibit a blue color, a size reduction with compression, and variable size with Valsalva maneuver.

The gold standard diagnostic tool for most dermatologic conditions is histopathology; however, dermatologic ultrasonography can provide noninvasive, real-time, important diagnostic characteristics of cutaneous pathologies as well as VA.^5-7 Crisan et al⁶ outlined specific sonographic findings of lipomas, EICs, trichilemmal cysts, and other dermatologic conditions as well as the associated surgical pertinence. Ultrasonography of a venous aneurysm may show a heterogeneous, contiguous, echoic lesion with an adjacent superficial vein, which may be easily compressed by the probe.⁸ Advanced imaging such as computed tomography with contrast or magnetic resonance imaging may be performed, but these are more costly than ultrasonography. Additionally, point-of-care ultrasonography is becoming more popular and accessible for physicians to carry at bedside with portable tablet options available. Dermatologists may want to consider incorporating it into the outpatient setting to improve procedural planning.⁹

In conclusion, VAs should be included in the differential diagnosis of soft cutaneous nodules, as management differs from a cyst or lipoma. Dermatologists should use their clinical judgment preoperatively—including a comprehensive history, physical examination, and consideration of color Doppler ultrasonography to assess for findings of VA. We do not recommend intentional surgical exploration of cutaneous aneurysms in the ambulatory setting due to risk for hemorrhage. Furthermore, when clinical suspicion of EIC or lipoma is high, it still is preferable to descend the incision slowly at 1 to 2 mm per cut until the tumor is visualized.

To the Editor:

Cutaneous cysts commonly are treated by dermatologists and typically are diagnosed clinically, followed by intraoperative or histologic confirmation; however, cyst mimickers can be misdiagnosed due to similar appearance and limited diagnostic guidelines.¹ Vascular anomalies (VAs) of the face such as a facial aneurysm are rare.² Preoperative assessment of findings suggestive of vascular etiology vs other common cutaneous tumors such as an epidermal inclusion cyst (EIC) and lipoma can help guide dermatologic management. We present a case of a VA of the glabella manifesting as a flesh-colored nodule that clinically mimicked a cyst and discuss the subsequent surgical management.

A 61-year-old man with a history of benign prostatic hyperplasia was evaluated at our dermatology clinic for an enlarging forehead mass of 1 year’s duration. Physical examination yielded a soft, flesh-colored, 2.5-cm nodule located superficially in the midline glabellar region without pulsation or palpable thrill. The differential diagnosis at the time included lipoma or EIC.

Excision of the lesion was performed utilizing superficial incisions with a descending depth of 1-mm increments to safely reach the target, identify the type of tumor, and prevent rupture of the suspected EIC. After the third incision to the level of the dermis, nonpulsatile bleeding was more than expected for a cyst. Digital pressure was applied, and the area was explored with blunt dissection to identify the source of bleeding. A fusiform, thin-walled aneurysm was identified in the dermal plane with additional tributaries coursing deep into the subcutaneous plane. The visualized tributaries were ligated with 3-0 polyglactin, figure-of-eight sutures resulting in hemostasis. The wound was closed with 5-0 nylon simple interrupted sutures. The patient was closely followed postoperatively for 1 week (Figure) and was referred for head imaging to evaluate for a possible associated intracranial aneurysm. Based on the thin vessel wall and continuous nonpulsatile hemorrhage, this VA was most consistent with venous aneurysm.

A VA can be encountered unexpectedly during dermatologic surgery. An aneurysm is a type of VA and is defined as an abnormal dilatation of a blood vessel that can be arterial, venous, or an arteriovenous malformation. Most reported aneurysms of the head and neck are cirsoid aneurysms or involve the superficial temporal artery.^2,3 Reports of superficial venous aneurysms are rare.⁴ Preoperatively, cutaneous nodules can be evaluated for findings suggestive of a VA in the dermatologist’s office through physical examination. Arterial aneurysms may reveal palpable pulsation and audible bruit, while a venous aneurysm may exhibit a blue color, a size reduction with compression, and variable size with Valsalva maneuver.

The gold standard diagnostic tool for most dermatologic conditions is histopathology; however, dermatologic ultrasonography can provide noninvasive, real-time, important diagnostic characteristics of cutaneous pathologies as well as VA.^5-7 Crisan et al⁶ outlined specific sonographic findings of lipomas, EICs, trichilemmal cysts, and other dermatologic conditions as well as the associated surgical pertinence. Ultrasonography of a venous aneurysm may show a heterogeneous, contiguous, echoic lesion with an adjacent superficial vein, which may be easily compressed by the probe.⁸ Advanced imaging such as computed tomography with contrast or magnetic resonance imaging may be performed, but these are more costly than ultrasonography. Additionally, point-of-care ultrasonography is becoming more popular and accessible for physicians to carry at bedside with portable tablet options available. Dermatologists may want to consider incorporating it into the outpatient setting to improve procedural planning.⁹

In conclusion, VAs should be included in the differential diagnosis of soft cutaneous nodules, as management differs from a cyst or lipoma. Dermatologists should use their clinical judgment preoperatively—including a comprehensive history, physical examination, and consideration of color Doppler ultrasonography to assess for findings of VA. We do not recommend intentional surgical exploration of cutaneous aneurysms in the ambulatory setting due to risk for hemorrhage. Furthermore, when clinical suspicion of EIC or lipoma is high, it still is preferable to descend the incision slowly at 1 to 2 mm per cut until the tumor is visualized.

To the Editor:

Cutaneous cysts commonly are treated by dermatologists and typically are diagnosed clinically, followed by intraoperative or histologic confirmation; however, cyst mimickers can be misdiagnosed due to similar appearance and limited diagnostic guidelines.¹ Vascular anomalies (VAs) of the face such as a facial aneurysm are rare.² Preoperative assessment of findings suggestive of vascular etiology vs other common cutaneous tumors such as an epidermal inclusion cyst (EIC) and lipoma can help guide dermatologic management. We present a case of a VA of the glabella manifesting as a flesh-colored nodule that clinically mimicked a cyst and discuss the subsequent surgical management.

A 61-year-old man with a history of benign prostatic hyperplasia was evaluated at our dermatology clinic for an enlarging forehead mass of 1 year’s duration. Physical examination yielded a soft, flesh-colored, 2.5-cm nodule located superficially in the midline glabellar region without pulsation or palpable thrill. The differential diagnosis at the time included lipoma or EIC.

Excision of the lesion was performed utilizing superficial incisions with a descending depth of 1-mm increments to safely reach the target, identify the type of tumor, and prevent rupture of the suspected EIC. After the third incision to the level of the dermis, nonpulsatile bleeding was more than expected for a cyst. Digital pressure was applied, and the area was explored with blunt dissection to identify the source of bleeding. A fusiform, thin-walled aneurysm was identified in the dermal plane with additional tributaries coursing deep into the subcutaneous plane. The visualized tributaries were ligated with 3-0 polyglactin, figure-of-eight sutures resulting in hemostasis. The wound was closed with 5-0 nylon simple interrupted sutures. The patient was closely followed postoperatively for 1 week (Figure) and was referred for head imaging to evaluate for a possible associated intracranial aneurysm. Based on the thin vessel wall and continuous nonpulsatile hemorrhage, this VA was most consistent with venous aneurysm.

A VA can be encountered unexpectedly during dermatologic surgery. An aneurysm is a type of VA and is defined as an abnormal dilatation of a blood vessel that can be arterial, venous, or an arteriovenous malformation. Most reported aneurysms of the head and neck are cirsoid aneurysms or involve the superficial temporal artery.^2,3 Reports of superficial venous aneurysms are rare.⁴ Preoperatively, cutaneous nodules can be evaluated for findings suggestive of a VA in the dermatologist’s office through physical examination. Arterial aneurysms may reveal palpable pulsation and audible bruit, while a venous aneurysm may exhibit a blue color, a size reduction with compression, and variable size with Valsalva maneuver.

The gold standard diagnostic tool for most dermatologic conditions is histopathology; however, dermatologic ultrasonography can provide noninvasive, real-time, important diagnostic characteristics of cutaneous pathologies as well as VA.^5-7 Crisan et al⁶ outlined specific sonographic findings of lipomas, EICs, trichilemmal cysts, and other dermatologic conditions as well as the associated surgical pertinence. Ultrasonography of a venous aneurysm may show a heterogeneous, contiguous, echoic lesion with an adjacent superficial vein, which may be easily compressed by the probe.⁸ Advanced imaging such as computed tomography with contrast or magnetic resonance imaging may be performed, but these are more costly than ultrasonography. Additionally, point-of-care ultrasonography is becoming more popular and accessible for physicians to carry at bedside with portable tablet options available. Dermatologists may want to consider incorporating it into the outpatient setting to improve procedural planning.⁹

In conclusion, VAs should be included in the differential diagnosis of soft cutaneous nodules, as management differs from a cyst or lipoma. Dermatologists should use their clinical judgment preoperatively—including a comprehensive history, physical examination, and consideration of color Doppler ultrasonography to assess for findings of VA. We do not recommend intentional surgical exploration of cutaneous aneurysms in the ambulatory setting due to risk for hemorrhage. Furthermore, when clinical suspicion of EIC or lipoma is high, it still is preferable to descend the incision slowly at 1 to 2 mm per cut until the tumor is visualized.

The Diagnosis: Superior Vena Cava Syndrome

Computed tomography angiography of the chest confirmed a diagnosis of superior vena cava (SVC) syndrome due to external pressure of the indwelling catheter. Upon diagnosis, the left indwelling catheter was removed. Further testing to assess for a potential pulmonary embolism was negative. Resolution of the ectatic spider veins and patientreported intermittent facial swelling was achieved after catheter removal.

Superior vena cava syndrome occurs when the SVC is occluded due to extrinsic pressure or thrombosis. Although classically thought to be due to underlying bronchogenic carcinomas, all pathologies that cause compression of the SVC also can lead to vessel occlusion.¹ Superior vena cava syndrome initially can be detected on physical examination. The most prominent skin finding includes diffusely dilated blood vessels on the central chest wall, which indicate the presence of collateral blood vessels.¹ Imaging studies such as abdominal computed tomography can provide information on the etiology of the condition but are not required for diagnosis. Given the high correlation of SVC syndrome with underlying lung and mediastinal carcinomas, imaging was warranted in our patient. Imaging also can distinguish if the condition is due to external pressure or thrombosis.² For SVC syndrome due to thrombosis, endovascular therapy is first-line management; however, mechanical thrombectomy may be preferred in patients with absolute contraindication to thrombolytic agents.³ In the setting of increased external pressure on the SVC, treatment includes the removal of the source of pressure.⁴

In a case series including 78 patients, ports and indwelling catheters accounted for 71% of benign SVC cases.⁵ Our patient’s SVC syndrome most likely was due to the indwelling catheter pressing on the SVC. The goal of treatment is to address the underlying cause—whether it be pressure or thrombosis. In the setting of increased external pressure, treatment includes removal of the source of pressure from the SVC.⁴

Other differential diagnoses to consider for newonset ectatic vessels on the chest wall include generalized essential telangiectasia, scleroderma, poikiloderma vasculare atrophicans, and caput medusae. Generalized essential telangiectasia is characterized by red or pink dilated capillary blood vessels in a branch or lacelike pattern predominantly on the lower limbs. The eruption primarily is asymptomatic, though tingling or numbness may be reported.⁶ The diagnosis can be made with a punch biopsy, with histopathology showing dilated vessels in the dermis.⁷

Scleroderma is a connective tissue fibrosis disorder with variable clinical presentations. The systemic sclerosis subset can be divided into localized systemic sclerosis and diffuse systemic sclerosis. Physical examination reveals cutaneous sclerosis in various areas of the body. Localized systemic sclerosis includes sclerosis of the fingers and face, while diffuse systemic sclerosis is notable for progression to the arms, legs, and trunk.⁸ In addition to sclerosis, diffuse telangiectases also can be observed. Systemic sclerosis is a clinical diagnosis based on physical examination and laboratory studies to identify antibodies such as antinuclear antibodies.

Poikiloderma vasculare atrophicans is a variant of cutaneous T-cell lymphoma. The initial presentation is characterized by plaques of hypopigmentation and hyperpigmentation with atrophy and telangiectases. The lesions may be asymptomatic or mildly pruritic and classically involve the trunk and flexural areas.⁹ The diagnosis is made with skin biopsy and immunohistochemical studies, with findings reflective of mycosis fungoides.

Caput medusae (palm tree sign) is a cardinal feature of portal hypertension characterized by grossly dilated and engorged periumbilical veins. To shunt blood from the portal venous system, cutaneous collateral veins between the umbilical veins and abdominal wall veins are used, resulting in the appearance of engorged veins in the anterior abdominal wall.¹⁰ The diagnosis can be made with abdominal ultrasonography showing the direction of blood flow through abdominal vessels.

The Diagnosis: Superior Vena Cava Syndrome

Computed tomography angiography of the chest confirmed a diagnosis of superior vena cava (SVC) syndrome due to external pressure of the indwelling catheter. Upon diagnosis, the left indwelling catheter was removed. Further testing to assess for a potential pulmonary embolism was negative. Resolution of the ectatic spider veins and patientreported intermittent facial swelling was achieved after catheter removal.

Superior vena cava syndrome occurs when the SVC is occluded due to extrinsic pressure or thrombosis. Although classically thought to be due to underlying bronchogenic carcinomas, all pathologies that cause compression of the SVC also can lead to vessel occlusion.¹ Superior vena cava syndrome initially can be detected on physical examination. The most prominent skin finding includes diffusely dilated blood vessels on the central chest wall, which indicate the presence of collateral blood vessels.¹ Imaging studies such as abdominal computed tomography can provide information on the etiology of the condition but are not required for diagnosis. Given the high correlation of SVC syndrome with underlying lung and mediastinal carcinomas, imaging was warranted in our patient. Imaging also can distinguish if the condition is due to external pressure or thrombosis.² For SVC syndrome due to thrombosis, endovascular therapy is first-line management; however, mechanical thrombectomy may be preferred in patients with absolute contraindication to thrombolytic agents.³ In the setting of increased external pressure on the SVC, treatment includes the removal of the source of pressure.⁴

In a case series including 78 patients, ports and indwelling catheters accounted for 71% of benign SVC cases.⁵ Our patient’s SVC syndrome most likely was due to the indwelling catheter pressing on the SVC. The goal of treatment is to address the underlying cause—whether it be pressure or thrombosis. In the setting of increased external pressure, treatment includes removal of the source of pressure from the SVC.⁴

Other differential diagnoses to consider for newonset ectatic vessels on the chest wall include generalized essential telangiectasia, scleroderma, poikiloderma vasculare atrophicans, and caput medusae. Generalized essential telangiectasia is characterized by red or pink dilated capillary blood vessels in a branch or lacelike pattern predominantly on the lower limbs. The eruption primarily is asymptomatic, though tingling or numbness may be reported.⁶ The diagnosis can be made with a punch biopsy, with histopathology showing dilated vessels in the dermis.⁷

Scleroderma is a connective tissue fibrosis disorder with variable clinical presentations. The systemic sclerosis subset can be divided into localized systemic sclerosis and diffuse systemic sclerosis. Physical examination reveals cutaneous sclerosis in various areas of the body. Localized systemic sclerosis includes sclerosis of the fingers and face, while diffuse systemic sclerosis is notable for progression to the arms, legs, and trunk.⁸ In addition to sclerosis, diffuse telangiectases also can be observed. Systemic sclerosis is a clinical diagnosis based on physical examination and laboratory studies to identify antibodies such as antinuclear antibodies.

Poikiloderma vasculare atrophicans is a variant of cutaneous T-cell lymphoma. The initial presentation is characterized by plaques of hypopigmentation and hyperpigmentation with atrophy and telangiectases. The lesions may be asymptomatic or mildly pruritic and classically involve the trunk and flexural areas.⁹ The diagnosis is made with skin biopsy and immunohistochemical studies, with findings reflective of mycosis fungoides.

Caput medusae (palm tree sign) is a cardinal feature of portal hypertension characterized by grossly dilated and engorged periumbilical veins. To shunt blood from the portal venous system, cutaneous collateral veins between the umbilical veins and abdominal wall veins are used, resulting in the appearance of engorged veins in the anterior abdominal wall.¹⁰ The diagnosis can be made with abdominal ultrasonography showing the direction of blood flow through abdominal vessels.

The Diagnosis: Superior Vena Cava Syndrome

Computed tomography angiography of the chest confirmed a diagnosis of superior vena cava (SVC) syndrome due to external pressure of the indwelling catheter. Upon diagnosis, the left indwelling catheter was removed. Further testing to assess for a potential pulmonary embolism was negative. Resolution of the ectatic spider veins and patientreported intermittent facial swelling was achieved after catheter removal.

Superior vena cava syndrome occurs when the SVC is occluded due to extrinsic pressure or thrombosis. Although classically thought to be due to underlying bronchogenic carcinomas, all pathologies that cause compression of the SVC also can lead to vessel occlusion.¹ Superior vena cava syndrome initially can be detected on physical examination. The most prominent skin finding includes diffusely dilated blood vessels on the central chest wall, which indicate the presence of collateral blood vessels.¹ Imaging studies such as abdominal computed tomography can provide information on the etiology of the condition but are not required for diagnosis. Given the high correlation of SVC syndrome with underlying lung and mediastinal carcinomas, imaging was warranted in our patient. Imaging also can distinguish if the condition is due to external pressure or thrombosis.² For SVC syndrome due to thrombosis, endovascular therapy is first-line management; however, mechanical thrombectomy may be preferred in patients with absolute contraindication to thrombolytic agents.³ In the setting of increased external pressure on the SVC, treatment includes the removal of the source of pressure.⁴

In a case series including 78 patients, ports and indwelling catheters accounted for 71% of benign SVC cases.⁵ Our patient’s SVC syndrome most likely was due to the indwelling catheter pressing on the SVC. The goal of treatment is to address the underlying cause—whether it be pressure or thrombosis. In the setting of increased external pressure, treatment includes removal of the source of pressure from the SVC.⁴

Other differential diagnoses to consider for newonset ectatic vessels on the chest wall include generalized essential telangiectasia, scleroderma, poikiloderma vasculare atrophicans, and caput medusae. Generalized essential telangiectasia is characterized by red or pink dilated capillary blood vessels in a branch or lacelike pattern predominantly on the lower limbs. The eruption primarily is asymptomatic, though tingling or numbness may be reported.⁶ The diagnosis can be made with a punch biopsy, with histopathology showing dilated vessels in the dermis.⁷

Scleroderma is a connective tissue fibrosis disorder with variable clinical presentations. The systemic sclerosis subset can be divided into localized systemic sclerosis and diffuse systemic sclerosis. Physical examination reveals cutaneous sclerosis in various areas of the body. Localized systemic sclerosis includes sclerosis of the fingers and face, while diffuse systemic sclerosis is notable for progression to the arms, legs, and trunk.⁸ In addition to sclerosis, diffuse telangiectases also can be observed. Systemic sclerosis is a clinical diagnosis based on physical examination and laboratory studies to identify antibodies such as antinuclear antibodies.

Poikiloderma vasculare atrophicans is a variant of cutaneous T-cell lymphoma. The initial presentation is characterized by plaques of hypopigmentation and hyperpigmentation with atrophy and telangiectases. The lesions may be asymptomatic or mildly pruritic and classically involve the trunk and flexural areas.⁹ The diagnosis is made with skin biopsy and immunohistochemical studies, with findings reflective of mycosis fungoides.

Caput medusae (palm tree sign) is a cardinal feature of portal hypertension characterized by grossly dilated and engorged periumbilical veins. To shunt blood from the portal venous system, cutaneous collateral veins between the umbilical veins and abdominal wall veins are used, resulting in the appearance of engorged veins in the anterior abdominal wall.¹⁰ The diagnosis can be made with abdominal ultrasonography showing the direction of blood flow through abdominal vessels.

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Commonly known as neem or nimba, Azadirachta indica traditionally has been used as an oil or poultice to lighten skin pigment and reduce joint inflammation. Neem is a drought-resistant evergreen tree with thin serrated leaves, white fragrant flowers, and olivelike fruit (Figure 1). This plant is indigenous to India but also is readily found within tropical and semitropical environments throughout the Middle East, Southeast Asia, North Africa, and Australia.

Traditional Uses

For more than 4000 years, neem leaves, bark, fruit, and seeds have been used in food, insecticide, and herbal medicine cross-culturally in Indian Ayurvedic medicine and across Southeast Asia, particularly in Cambodia, Laos, Thailand, Myanmar, and Vietnam.^1-3 Because of its many essential nutrients—oleic acid, palmitic acid, stearic acid, linoleic acid, behenic acid, arachidic acid, and palmitoleic acid—and readily available nature, some ethnic groups include neem in their diet.⁴ Neem commonly is used as a seasoning in soups and rice, eaten as a cooked vegetable, infused into teas and tonics, and pickled with other spices.⁵

All parts of the neem tree—both externally and internally—have been utilized in traditional medicine for the treatment of various diseases and ailments. The flowers have been used to treat eye diseases and dyspepsia, the fruit has been employed as an anthelmintic, the seeds and leaves have been used for malaria treatment and insecticide, the stem bark has been used for the treatment of diarrhea, and the root bark has been used for skin diseases and inflammation.⁶ Neem oil is a yellow-brown bitter substance that often is utilized to treat skin diseases such as psoriasis, eczema, fungal infections, and abscesses.

Case Report—A 77-year-old man presented with a diffuse rash across the lower back. He reported that he had been using topical neem oil to alleviate lower back pain and arthritis for the last 6 months with noted relief and improvement of back pain. After roughly 3 to 4 months of using neem oil, he noted a rash on the lower back, bilateral flanks, and buttocks (Figure 2). The rash was asymptomatic, and he denied any pruritus, scaling, pain, or burning. The patient was referred to dermatology and received a diagnosis of chemical leukoderma secondary to contact with A indica. The patient was advised to stop using the topical neem oil, and the rash was simply monitored, as it was asymptomatic.

Bioactivity

Research has elucidated multiple bioactivity mechanisms of neem, including melanogenesis-inhibitory activity, toxicity against pests, antimalarial activity, and antioxidant activity.^1,7-9 Literature on the diverse phytochemical components of A indica indicate high levels of limonoids, flavonoids, and triterpenoids that are responsible for much of its antioxidant, anti-inflammatory, and insecticide properties.^1,10

Melanogenesis-Inhibitory Activity—To date, neem has been added to a number of cosmetic products used in Ayurvedic medicine. One study of isolated compounds in A indica showed superior inhibitory activities against melanogenesis with minimal toxicity to cells (86.5%–105.1% cell viability). Western blot analysis of samples extracted and isolated from neem root and bark showed melanogenesis-inhibitory activities in B16 melanoma cells through the inhibition of microphthalmia-associated transcription factor expression and decreased expression of tyrosinase, as well as tyrosinase-related proteins 1 and 2, which are largely responsible for melanin synthesis.¹¹ In another study, A indica flowers and their extracted constituents—6-deacetylnimbin and kaempferide—suggest melanogenesis-inhibitory activities in B16 melanoma cells with little to no toxicity to the cells (81.0%–111.7% cell viability).¹ In an evaluationof A indica seed extracts, some of the isolated limonoids and diterpenoids exhibited a marked melanogenesis-inhibitory effect (74%–91% reduction of melanin content) with no toxicity to the cell.⁵ All of these studies indicate that active compounds in neem root, bark, flowers, and seeds may be potential skin-lightening agents.

Toxicity Against Pests—Neem seeds have phytochemicals that convey some insecticidal properties. The seeds often are ground into a powder, combined with water, and sprayed onto crops to act as an insecticide. As a natural method of nonpesticidal management, A indica acts as an antifeedant, insect repellent, and egg-laying deterrent that protects crops from damage. Studies of A indica have noted effective nonpesticidal management against arthropod pests such as armyworm, termites, and the oriental fruit fly.^7,12,13

Antimalarial Activity—One study indicated that nimbolide, a limonoid from the neem plant, demonstrated antimalarial activity against Plasmodium falciparum. In separate cultures of asexual parasites and mature gametocytes, parasite numbers were less than 50% of the number in control cultures (8.0% vs 8.5% parasitemia, respectively).¹⁴ Thus, the lower parasite numbers indicated by this study highlight the antimalarial utility of nimbolide and neem oil.

Antioxidant and Anti-inflammatory Activity—Neem bark has been reported to have considerable antioxidant activity due to its high phenolic content.^1,15 One study showed that azadirachtin and nimbolide in neem exhibited concentration-dependent antiradical scavenging activity and antioxidant properties.¹⁶

The anti-inflammatory potential for neem may occur via the inhibition of the nuclear factor-κB signaling pathway, which is linked to cancer, inflammation, and apoptosis.¹⁷ It also has been observed that nimbidin within neem extracts—such as leaves, bark, and seed extract—suppresses the function of macrophages and neutrophils relevant to inflammation.¹⁶ Another study indicated neem’s anti-inflammatory activity due to the regulation of proinflammatory enzymes such as cyclooxygenase and lipoxygenase.¹⁸

Safety, Toxicity, and Risks

Ingestion—Although neem is safe to use in the general population, neem oil poisoning has been reported, particularly in young children. Ingesting large quantities of neem has resulted in vomiting, hepatic toxicity, metabolic acidosis, late neurologic sequelae, and encephalopathy in young children.¹⁹ The diagnosis of neem oil poisoning is based on patient history, clinical examination, and imaging findings. Poisoning can manifest as drowsiness, tachypnea, and generalized seizures.²⁰

Topical Application—Topical use of neem appears to be safe if the substance is diluted with other ingredients. However, direct application to the skin is not advised, as it may cause leukoderma and could induce allergic contact dermatitis and other allergic reactions.⁴

Final Thoughts

The use of neem extract for disease prevention and treatment has been prevalent around the world since ancient times. Neem has been documented to possess melanogenesis-inhibitory activity, toxicity against pests, antimalarial activity, and antioxidant activity by means of tyrosinase inhibition, phytochemical production, limonoid expression, and nuclear factor-κB regulation, respectively. However, topical use of neem may trigger a cutaneous response, highlighting the importance of considering a diagnosis of neem oil–induced chemical leukoderma when patients present with a hypopigmented rash and relevant history.

Commonly known as neem or nimba, Azadirachta indica traditionally has been used as an oil or poultice to lighten skin pigment and reduce joint inflammation. Neem is a drought-resistant evergreen tree with thin serrated leaves, white fragrant flowers, and olivelike fruit (Figure 1). This plant is indigenous to India but also is readily found within tropical and semitropical environments throughout the Middle East, Southeast Asia, North Africa, and Australia.

Traditional Uses

For more than 4000 years, neem leaves, bark, fruit, and seeds have been used in food, insecticide, and herbal medicine cross-culturally in Indian Ayurvedic medicine and across Southeast Asia, particularly in Cambodia, Laos, Thailand, Myanmar, and Vietnam.^1-3 Because of its many essential nutrients—oleic acid, palmitic acid, stearic acid, linoleic acid, behenic acid, arachidic acid, and palmitoleic acid—and readily available nature, some ethnic groups include neem in their diet.⁴ Neem commonly is used as a seasoning in soups and rice, eaten as a cooked vegetable, infused into teas and tonics, and pickled with other spices.⁵

All parts of the neem tree—both externally and internally—have been utilized in traditional medicine for the treatment of various diseases and ailments. The flowers have been used to treat eye diseases and dyspepsia, the fruit has been employed as an anthelmintic, the seeds and leaves have been used for malaria treatment and insecticide, the stem bark has been used for the treatment of diarrhea, and the root bark has been used for skin diseases and inflammation.⁶ Neem oil is a yellow-brown bitter substance that often is utilized to treat skin diseases such as psoriasis, eczema, fungal infections, and abscesses.

Case Report—A 77-year-old man presented with a diffuse rash across the lower back. He reported that he had been using topical neem oil to alleviate lower back pain and arthritis for the last 6 months with noted relief and improvement of back pain. After roughly 3 to 4 months of using neem oil, he noted a rash on the lower back, bilateral flanks, and buttocks (Figure 2). The rash was asymptomatic, and he denied any pruritus, scaling, pain, or burning. The patient was referred to dermatology and received a diagnosis of chemical leukoderma secondary to contact with A indica. The patient was advised to stop using the topical neem oil, and the rash was simply monitored, as it was asymptomatic.

Bioactivity

Research has elucidated multiple bioactivity mechanisms of neem, including melanogenesis-inhibitory activity, toxicity against pests, antimalarial activity, and antioxidant activity.^1,7-9 Literature on the diverse phytochemical components of A indica indicate high levels of limonoids, flavonoids, and triterpenoids that are responsible for much of its antioxidant, anti-inflammatory, and insecticide properties.^1,10

Melanogenesis-Inhibitory Activity—To date, neem has been added to a number of cosmetic products used in Ayurvedic medicine. One study of isolated compounds in A indica showed superior inhibitory activities against melanogenesis with minimal toxicity to cells (86.5%–105.1% cell viability). Western blot analysis of samples extracted and isolated from neem root and bark showed melanogenesis-inhibitory activities in B16 melanoma cells through the inhibition of microphthalmia-associated transcription factor expression and decreased expression of tyrosinase, as well as tyrosinase-related proteins 1 and 2, which are largely responsible for melanin synthesis.¹¹ In another study, A indica flowers and their extracted constituents—6-deacetylnimbin and kaempferide—suggest melanogenesis-inhibitory activities in B16 melanoma cells with little to no toxicity to the cells (81.0%–111.7% cell viability).¹ In an evaluationof A indica seed extracts, some of the isolated limonoids and diterpenoids exhibited a marked melanogenesis-inhibitory effect (74%–91% reduction of melanin content) with no toxicity to the cell.⁵ All of these studies indicate that active compounds in neem root, bark, flowers, and seeds may be potential skin-lightening agents.

Toxicity Against Pests—Neem seeds have phytochemicals that convey some insecticidal properties. The seeds often are ground into a powder, combined with water, and sprayed onto crops to act as an insecticide. As a natural method of nonpesticidal management, A indica acts as an antifeedant, insect repellent, and egg-laying deterrent that protects crops from damage. Studies of A indica have noted effective nonpesticidal management against arthropod pests such as armyworm, termites, and the oriental fruit fly.^7,12,13

Antimalarial Activity—One study indicated that nimbolide, a limonoid from the neem plant, demonstrated antimalarial activity against Plasmodium falciparum. In separate cultures of asexual parasites and mature gametocytes, parasite numbers were less than 50% of the number in control cultures (8.0% vs 8.5% parasitemia, respectively).¹⁴ Thus, the lower parasite numbers indicated by this study highlight the antimalarial utility of nimbolide and neem oil.

Antioxidant and Anti-inflammatory Activity—Neem bark has been reported to have considerable antioxidant activity due to its high phenolic content.^1,15 One study showed that azadirachtin and nimbolide in neem exhibited concentration-dependent antiradical scavenging activity and antioxidant properties.¹⁶

The anti-inflammatory potential for neem may occur via the inhibition of the nuclear factor-κB signaling pathway, which is linked to cancer, inflammation, and apoptosis.¹⁷ It also has been observed that nimbidin within neem extracts—such as leaves, bark, and seed extract—suppresses the function of macrophages and neutrophils relevant to inflammation.¹⁶ Another study indicated neem’s anti-inflammatory activity due to the regulation of proinflammatory enzymes such as cyclooxygenase and lipoxygenase.¹⁸

Safety, Toxicity, and Risks

Ingestion—Although neem is safe to use in the general population, neem oil poisoning has been reported, particularly in young children. Ingesting large quantities of neem has resulted in vomiting, hepatic toxicity, metabolic acidosis, late neurologic sequelae, and encephalopathy in young children.¹⁹ The diagnosis of neem oil poisoning is based on patient history, clinical examination, and imaging findings. Poisoning can manifest as drowsiness, tachypnea, and generalized seizures.²⁰

Topical Application—Topical use of neem appears to be safe if the substance is diluted with other ingredients. However, direct application to the skin is not advised, as it may cause leukoderma and could induce allergic contact dermatitis and other allergic reactions.⁴

Final Thoughts

The use of neem extract for disease prevention and treatment has been prevalent around the world since ancient times. Neem has been documented to possess melanogenesis-inhibitory activity, toxicity against pests, antimalarial activity, and antioxidant activity by means of tyrosinase inhibition, phytochemical production, limonoid expression, and nuclear factor-κB regulation, respectively. However, topical use of neem may trigger a cutaneous response, highlighting the importance of considering a diagnosis of neem oil–induced chemical leukoderma when patients present with a hypopigmented rash and relevant history.

Commonly known as neem or nimba, Azadirachta indica traditionally has been used as an oil or poultice to lighten skin pigment and reduce joint inflammation. Neem is a drought-resistant evergreen tree with thin serrated leaves, white fragrant flowers, and olivelike fruit (Figure 1). This plant is indigenous to India but also is readily found within tropical and semitropical environments throughout the Middle East, Southeast Asia, North Africa, and Australia.

Traditional Uses

For more than 4000 years, neem leaves, bark, fruit, and seeds have been used in food, insecticide, and herbal medicine cross-culturally in Indian Ayurvedic medicine and across Southeast Asia, particularly in Cambodia, Laos, Thailand, Myanmar, and Vietnam.^1-3 Because of its many essential nutrients—oleic acid, palmitic acid, stearic acid, linoleic acid, behenic acid, arachidic acid, and palmitoleic acid—and readily available nature, some ethnic groups include neem in their diet.⁴ Neem commonly is used as a seasoning in soups and rice, eaten as a cooked vegetable, infused into teas and tonics, and pickled with other spices.⁵

All parts of the neem tree—both externally and internally—have been utilized in traditional medicine for the treatment of various diseases and ailments. The flowers have been used to treat eye diseases and dyspepsia, the fruit has been employed as an anthelmintic, the seeds and leaves have been used for malaria treatment and insecticide, the stem bark has been used for the treatment of diarrhea, and the root bark has been used for skin diseases and inflammation.⁶ Neem oil is a yellow-brown bitter substance that often is utilized to treat skin diseases such as psoriasis, eczema, fungal infections, and abscesses.

Case Report—A 77-year-old man presented with a diffuse rash across the lower back. He reported that he had been using topical neem oil to alleviate lower back pain and arthritis for the last 6 months with noted relief and improvement of back pain. After roughly 3 to 4 months of using neem oil, he noted a rash on the lower back, bilateral flanks, and buttocks (Figure 2). The rash was asymptomatic, and he denied any pruritus, scaling, pain, or burning. The patient was referred to dermatology and received a diagnosis of chemical leukoderma secondary to contact with A indica. The patient was advised to stop using the topical neem oil, and the rash was simply monitored, as it was asymptomatic.

Bioactivity

Research has elucidated multiple bioactivity mechanisms of neem, including melanogenesis-inhibitory activity, toxicity against pests, antimalarial activity, and antioxidant activity.^1,7-9 Literature on the diverse phytochemical components of A indica indicate high levels of limonoids, flavonoids, and triterpenoids that are responsible for much of its antioxidant, anti-inflammatory, and insecticide properties.^1,10

Melanogenesis-Inhibitory Activity—To date, neem has been added to a number of cosmetic products used in Ayurvedic medicine. One study of isolated compounds in A indica showed superior inhibitory activities against melanogenesis with minimal toxicity to cells (86.5%–105.1% cell viability). Western blot analysis of samples extracted and isolated from neem root and bark showed melanogenesis-inhibitory activities in B16 melanoma cells through the inhibition of microphthalmia-associated transcription factor expression and decreased expression of tyrosinase, as well as tyrosinase-related proteins 1 and 2, which are largely responsible for melanin synthesis.¹¹ In another study, A indica flowers and their extracted constituents—6-deacetylnimbin and kaempferide—suggest melanogenesis-inhibitory activities in B16 melanoma cells with little to no toxicity to the cells (81.0%–111.7% cell viability).¹ In an evaluationof A indica seed extracts, some of the isolated limonoids and diterpenoids exhibited a marked melanogenesis-inhibitory effect (74%–91% reduction of melanin content) with no toxicity to the cell.⁵ All of these studies indicate that active compounds in neem root, bark, flowers, and seeds may be potential skin-lightening agents.

Toxicity Against Pests—Neem seeds have phytochemicals that convey some insecticidal properties. The seeds often are ground into a powder, combined with water, and sprayed onto crops to act as an insecticide. As a natural method of nonpesticidal management, A indica acts as an antifeedant, insect repellent, and egg-laying deterrent that protects crops from damage. Studies of A indica have noted effective nonpesticidal management against arthropod pests such as armyworm, termites, and the oriental fruit fly.^7,12,13

Antimalarial Activity—One study indicated that nimbolide, a limonoid from the neem plant, demonstrated antimalarial activity against Plasmodium falciparum. In separate cultures of asexual parasites and mature gametocytes, parasite numbers were less than 50% of the number in control cultures (8.0% vs 8.5% parasitemia, respectively).¹⁴ Thus, the lower parasite numbers indicated by this study highlight the antimalarial utility of nimbolide and neem oil.

Antioxidant and Anti-inflammatory Activity—Neem bark has been reported to have considerable antioxidant activity due to its high phenolic content.^1,15 One study showed that azadirachtin and nimbolide in neem exhibited concentration-dependent antiradical scavenging activity and antioxidant properties.¹⁶

The anti-inflammatory potential for neem may occur via the inhibition of the nuclear factor-κB signaling pathway, which is linked to cancer, inflammation, and apoptosis.¹⁷ It also has been observed that nimbidin within neem extracts—such as leaves, bark, and seed extract—suppresses the function of macrophages and neutrophils relevant to inflammation.¹⁶ Another study indicated neem’s anti-inflammatory activity due to the regulation of proinflammatory enzymes such as cyclooxygenase and lipoxygenase.¹⁸

Safety, Toxicity, and Risks

Ingestion—Although neem is safe to use in the general population, neem oil poisoning has been reported, particularly in young children. Ingesting large quantities of neem has resulted in vomiting, hepatic toxicity, metabolic acidosis, late neurologic sequelae, and encephalopathy in young children.¹⁹ The diagnosis of neem oil poisoning is based on patient history, clinical examination, and imaging findings. Poisoning can manifest as drowsiness, tachypnea, and generalized seizures.²⁰

Topical Application—Topical use of neem appears to be safe if the substance is diluted with other ingredients. However, direct application to the skin is not advised, as it may cause leukoderma and could induce allergic contact dermatitis and other allergic reactions.⁴

Final Thoughts

The use of neem extract for disease prevention and treatment has been prevalent around the world since ancient times. Neem has been documented to possess melanogenesis-inhibitory activity, toxicity against pests, antimalarial activity, and antioxidant activity by means of tyrosinase inhibition, phytochemical production, limonoid expression, and nuclear factor-κB regulation, respectively. However, topical use of neem may trigger a cutaneous response, highlighting the importance of considering a diagnosis of neem oil–induced chemical leukoderma when patients present with a hypopigmented rash and relevant history.

Internet platforms have become a common source of medical information for individuals with a broad range of skin conditions including vitiligo. The prevalence of vitiligo among US adults ranges from 0.76% to 1.11%, with approximately 40% of adult cases of vitiligo in the United States remaining undiagnosed.¹ The vitiligo community has become more inquisitive of the relationship between diet and vitiligo, turning to online sources for suggestions on diet modifications that may be beneficial for their condition. Although there is an abundance of online information, few diets or foods have been medically recognized to definitively improve or worsen vitiligo symptoms. We reviewed the top online web pages accessible to the public regarding diet suggestions that affect vitiligo symptoms. We then compared these online results to published peer-reviewed scientific literature.

Methods

Two independent online searches were performed by Researcher 1 (Y.A.) and Researcher 2 (I.M.) using Google Advanced Search. The independent searches were performed by the reviewers in neighboring areas of Chicago, Illinois, using the same Internet browser (Google Chrome). The primary search terms were diet and vitiligo along with the optional additional terms dietary supplement(s), food(s), nutrition, herb(s), or vitamin(s). Our search included any web pages published or updated from January 1, 2010, to December 31, 2021, and originally scribed in the English language. The domains “.com,” “.org,” “.edu,” and “.cc” were included.

From this initial search, Researcher 1 identified 312 web pages and Researcher 2 identified 314 web pages. Each reviewer sorted their respective search results to identify the number of eligible records to be screened. Records were defined as unique web pages that met the search criteria. After removing duplicates, Researcher 1 screened 102 web pages and Researcher 2 screened 76 web pages. Of these records, web pages were excluded if they did not include any diet recommendations for vitiligo patients. Each reviewer independently created a list of eligible records, and the independent lists were then merged for a total of 58 web pages. Among these 58 web pages, there were 24 duplicate records and 3 records that were deemed ineligible for the study due to lack of subject matter relevance. A final total of 31 web pages were included in the data analysis (Figure). Of the 31 records selected, the reviewers jointly evaluated each web page and recorded the diet components that were recommended for individuals with vitiligo to either include or avoid (eTable).

For comparison and support from published scientific literature, a search of PubMed articles indexed for MEDLINE was conducted using the terms diet and vitiligo. Relevant human clinical studies published in the English-language literature were reviewed for content regarding the relationship between diet and vitiligo.

Results

Our online search revealed an abundance of information regarding various dietary modifications suggested to aid in the management of vitiligo symptoms. Most web pages (27/31 [87%]) were not authored by medical professionals or dermatologists. There were 27 diet components mentioned 8 or more times within the 31 total web pages. These diet components were selected for further review via PubMed. Each item was searched on PubMed using the term “[respective diet component] and vitiligo” among all published literature in the English language. Our study focused on summarizing the data on dietary components for which we were able to gather scientific support. These data have been organized into the following categories: vitamins, fruits, omega-3 fatty acids, grains, minerals, vegetables, and nuts.

Vitamins—The online literature recommended inclusion of vitamin supplements, in particular vitamins D and B₁₂, which aligned with published scientific literature.^2,3 Eleven of 31 (35%) web pages recommended vitamin D in vitiligo. A 2010 study analyzing patients with vitiligo vulgaris (N=45) found that 68.9% of the cohort had insufficient (<30 ng/mL) 25-hydroxyvitamin D levels.² A prospective study of 30 individuals found that the use of tacrolimus ointment plus oral vitamin D supplementation was found to be more successful in repigmentation than topical tacrolimus alone.³ Vitamin D dosage ranged from 1500 IU/d if the patient’s serum 25-hydroxyvitamin D levels were less than 20 ng/mL to 3000 IU/d if the serum levels were less than 10 ng/mL for 6 months.

Dairy products are a source of vitamin D.^2,3 Of the web pages that mentioned dairy, a subtle majority (4/7 [57%]) recommended the inclusion of dairy products. Although many web pages did not specify whether oral vitamin D supplementation vs dietary food consumption is preferred, a 2013 controlled study of 16 vitiligo patients who received high doses of vitamin D supplementation with a low-calcium diet found that 4 patients showed 1% to 25% repigmentation, 5 patients showed 26% to 50% repigmentation, and 5 patients showed 51% to 75% repigmentation of the affected areas.⁴

Eleven of 31 (35%) web pages recommended inclusion of vitamin B₁₂ supplementation in vitiligo. A 2-year study with 100 participants showed that supplementation with folic acid and vitamin B₁₂ along with sun exposure yielded more effective repigmentation than either vitamins or sun exposure alone.⁵ An additional hypothesis suggested vitamin B₁₂ may aid in repigmentation through its role in the homocysteine pathway. Although the theory is unproven, it is proposed that inhibition of homocysteine via vitamin B₁₂ or folic acid supplementation may play a role in reducing melanocyte destruction and restoring melanin synthesis.⁶

There were mixed recommendations regarding vitamin C via supplementation and/or eating citrus fruits such as oranges. Although there are limited clinical studies on the use of vitamin C and the treatment of vitiligo, a 6-year prospective study from Madagascar consisting of approximately 300 participants with vitiligo who were treated with a combination of topical corticosteroids, oral vitamin C, and oral vitamin B₁₂ supplementation showed excellent repigmentation (defined by repigmentation of more than 76% of the originally affected area) in 50 participants.⁷

Fruits—Most web pages had mixed recommendations on whether to include or avoid certain fruits. Interestingly, inclusion of mangoes and apricots in the diet were highly recommended (9/31 [29%] and 8/31 [26%], respectively) while fruits such as oranges, lemons, papayas, and grapes were discouraged (10/31 [32%], 8/31 [26%], 6/31 [19%], and 7/31 [23%], respectively). Although some web pages suggested that vitamin C–rich produce including citrus and berries may help to increase melanin formation, others strongly suggested avoiding these fruits. There is limited information on the effects of citrus on vitiligo, but a 2022 study indicated that 5-demethylnobiletin, a flavonoid found in sweet citrus fruits, may stimulate melanin synthesis, which can possibly be beneficial for vitiligo.⁸

Omega-3 Fatty Acids—Seven of 31 (23%) web pages recommended the inclusion of omega-3 fatty acids for their role as antioxidants to improve vitiligo symptoms. Research has indicated a strong association between vitiligo and oxidative stress.⁹ A 2007 controlled clinical trial that included 28 vitiligo patients demonstrated that oral antioxidant supplementation in combination with narrowband UVB phototherapy can significantly decrease vitiligo-associated oxidative stress (P<.05); 8 of 17 (47%) patients in the treatment group saw greater than 75% repigmentation after antioxidant treatment.¹⁰

Grains—Five of 31 (16%) web pages suggested avoiding gluten—a protein naturally found in some grains including wheat, barley, and rye—to improve vitiligo symptoms. A 2021 review suggested that a gluten-free diet may be effective in managing celiac disease, and it is hypothesized that vitiligo may be managed with similar dietary adjustments.¹¹ Studies have shown that celiac disease and vitiligo—both autoimmune conditions—involve IL-2, IL-6, IL-7, and IL-21 in their disease pathways.^12,13 Their shared immunogenic mechanism may account for similar management options.

Upon review, 2 case reports were identified that discussed a relationship between a gluten-free diet and vitiligo symptom improvement. In one report, a 9-year-old child diagnosed with both celiac disease and vitiligo saw intense repigmentation of the skin after adhering to a gluten-free diet for 1 year.¹⁴ Another case study reported a 22-year-old woman with vitiligo whose symptoms improved after 1 month of a gluten-free diet following 2 years of failed treatment with a topical steroid and phototherapy.¹⁵

Seven of 31 (23%) web pages suggested that individuals with vitiligo should include wheat in their diet. There is no published literature discussing the relationship between vitiligo and wheat. Of the 31 web pages reviewed, 10 (32%) suggested including whole grain. There is no relevant scientific evidence or hypotheses describing how whole grains may be beneficial in vitiligo.

Minerals—Eight of 31 (26%) web pages suggested including zinc in the diet to improve vitiligo symptoms. A 2020 study evaluated how different serum levels of zinc in vitiligo patients might be affiliated with interleukin activity. Fifty patients diagnosed with active vitiligo were tested for serum levels of zinc, IL-4, IL-6, and IL-17.¹⁶ The results showed that mean serum levels of zinc were lower in vitiligo patients compared with patients without vitiligo. The study concluded that zinc could possibly be used as a supplement to improve vitiligo, though the dosage needs to be further studied and confirmed.¹⁶

Vegetables—Eleven of 31 (35%) web pages recommended leafy green vegetables and 13 of 31 (42%) recommended spinach for patients with vitiligo. Spinach and other leafy green vegetables are known to be rich in antioxidants, which may have protective effects against reactive oxygen species that are thought to contribute to vitiligo progression.^17,18

Nuts—Walnuts were recommended in 11 of 31 (35%) web pages. Nuts may be beneficial in reducing inflammation and providing protection against oxidative stress.⁹ However, there is no specific scientific literature that supports the inclusion of nuts in the diet to manage vitiligo symptoms.

Comment

With a growing amount of research suggesting that diet modifications may contribute to management of certain skin conditions, vitiligo patients often inquire about foods or supplements that may help improve their condition.¹⁹ Our review highlighted what information was available to the public regarding diet and vitiligo, with preliminary support of the following primary diet components: vitamin D, vitamin B₁₂, zinc, and omega-3 fatty acids. Our review showed no support in the literature for the items that were recommended to avoid. It is important to note that 27 of 31 (87%) web pages from our online search were not authored by medical professionals or dermatologists. Additionally, many web pages suggested conflicting information, making it difficult to draw concrete conclusions about what diet modifications will be beneficial to the vitiligo community. Further controlled clinical trials are warranted due to the lack of formal studies that assess the relationship between diet and vitiligo.

Internet platforms have become a common source of medical information for individuals with a broad range of skin conditions including vitiligo. The prevalence of vitiligo among US adults ranges from 0.76% to 1.11%, with approximately 40% of adult cases of vitiligo in the United States remaining undiagnosed.¹ The vitiligo community has become more inquisitive of the relationship between diet and vitiligo, turning to online sources for suggestions on diet modifications that may be beneficial for their condition. Although there is an abundance of online information, few diets or foods have been medically recognized to definitively improve or worsen vitiligo symptoms. We reviewed the top online web pages accessible to the public regarding diet suggestions that affect vitiligo symptoms. We then compared these online results to published peer-reviewed scientific literature.

Methods

Two independent online searches were performed by Researcher 1 (Y.A.) and Researcher 2 (I.M.) using Google Advanced Search. The independent searches were performed by the reviewers in neighboring areas of Chicago, Illinois, using the same Internet browser (Google Chrome). The primary search terms were diet and vitiligo along with the optional additional terms dietary supplement(s), food(s), nutrition, herb(s), or vitamin(s). Our search included any web pages published or updated from January 1, 2010, to December 31, 2021, and originally scribed in the English language. The domains “.com,” “.org,” “.edu,” and “.cc” were included.

From this initial search, Researcher 1 identified 312 web pages and Researcher 2 identified 314 web pages. Each reviewer sorted their respective search results to identify the number of eligible records to be screened. Records were defined as unique web pages that met the search criteria. After removing duplicates, Researcher 1 screened 102 web pages and Researcher 2 screened 76 web pages. Of these records, web pages were excluded if they did not include any diet recommendations for vitiligo patients. Each reviewer independently created a list of eligible records, and the independent lists were then merged for a total of 58 web pages. Among these 58 web pages, there were 24 duplicate records and 3 records that were deemed ineligible for the study due to lack of subject matter relevance. A final total of 31 web pages were included in the data analysis (Figure). Of the 31 records selected, the reviewers jointly evaluated each web page and recorded the diet components that were recommended for individuals with vitiligo to either include or avoid (eTable).

For comparison and support from published scientific literature, a search of PubMed articles indexed for MEDLINE was conducted using the terms diet and vitiligo. Relevant human clinical studies published in the English-language literature were reviewed for content regarding the relationship between diet and vitiligo.

Results

Our online search revealed an abundance of information regarding various dietary modifications suggested to aid in the management of vitiligo symptoms. Most web pages (27/31 [87%]) were not authored by medical professionals or dermatologists. There were 27 diet components mentioned 8 or more times within the 31 total web pages. These diet components were selected for further review via PubMed. Each item was searched on PubMed using the term “[respective diet component] and vitiligo” among all published literature in the English language. Our study focused on summarizing the data on dietary components for which we were able to gather scientific support. These data have been organized into the following categories: vitamins, fruits, omega-3 fatty acids, grains, minerals, vegetables, and nuts.

Vitamins—The online literature recommended inclusion of vitamin supplements, in particular vitamins D and B₁₂, which aligned with published scientific literature.^2,3 Eleven of 31 (35%) web pages recommended vitamin D in vitiligo. A 2010 study analyzing patients with vitiligo vulgaris (N=45) found that 68.9% of the cohort had insufficient (<30 ng/mL) 25-hydroxyvitamin D levels.² A prospective study of 30 individuals found that the use of tacrolimus ointment plus oral vitamin D supplementation was found to be more successful in repigmentation than topical tacrolimus alone.³ Vitamin D dosage ranged from 1500 IU/d if the patient’s serum 25-hydroxyvitamin D levels were less than 20 ng/mL to 3000 IU/d if the serum levels were less than 10 ng/mL for 6 months.

Dairy products are a source of vitamin D.^2,3 Of the web pages that mentioned dairy, a subtle majority (4/7 [57%]) recommended the inclusion of dairy products. Although many web pages did not specify whether oral vitamin D supplementation vs dietary food consumption is preferred, a 2013 controlled study of 16 vitiligo patients who received high doses of vitamin D supplementation with a low-calcium diet found that 4 patients showed 1% to 25% repigmentation, 5 patients showed 26% to 50% repigmentation, and 5 patients showed 51% to 75% repigmentation of the affected areas.⁴

Eleven of 31 (35%) web pages recommended inclusion of vitamin B₁₂ supplementation in vitiligo. A 2-year study with 100 participants showed that supplementation with folic acid and vitamin B₁₂ along with sun exposure yielded more effective repigmentation than either vitamins or sun exposure alone.⁵ An additional hypothesis suggested vitamin B₁₂ may aid in repigmentation through its role in the homocysteine pathway. Although the theory is unproven, it is proposed that inhibition of homocysteine via vitamin B₁₂ or folic acid supplementation may play a role in reducing melanocyte destruction and restoring melanin synthesis.⁶

There were mixed recommendations regarding vitamin C via supplementation and/or eating citrus fruits such as oranges. Although there are limited clinical studies on the use of vitamin C and the treatment of vitiligo, a 6-year prospective study from Madagascar consisting of approximately 300 participants with vitiligo who were treated with a combination of topical corticosteroids, oral vitamin C, and oral vitamin B₁₂ supplementation showed excellent repigmentation (defined by repigmentation of more than 76% of the originally affected area) in 50 participants.⁷

Fruits—Most web pages had mixed recommendations on whether to include or avoid certain fruits. Interestingly, inclusion of mangoes and apricots in the diet were highly recommended (9/31 [29%] and 8/31 [26%], respectively) while fruits such as oranges, lemons, papayas, and grapes were discouraged (10/31 [32%], 8/31 [26%], 6/31 [19%], and 7/31 [23%], respectively). Although some web pages suggested that vitamin C–rich produce including citrus and berries may help to increase melanin formation, others strongly suggested avoiding these fruits. There is limited information on the effects of citrus on vitiligo, but a 2022 study indicated that 5-demethylnobiletin, a flavonoid found in sweet citrus fruits, may stimulate melanin synthesis, which can possibly be beneficial for vitiligo.⁸

Omega-3 Fatty Acids—Seven of 31 (23%) web pages recommended the inclusion of omega-3 fatty acids for their role as antioxidants to improve vitiligo symptoms. Research has indicated a strong association between vitiligo and oxidative stress.⁹ A 2007 controlled clinical trial that included 28 vitiligo patients demonstrated that oral antioxidant supplementation in combination with narrowband UVB phototherapy can significantly decrease vitiligo-associated oxidative stress (P<.05); 8 of 17 (47%) patients in the treatment group saw greater than 75% repigmentation after antioxidant treatment.¹⁰

Grains—Five of 31 (16%) web pages suggested avoiding gluten—a protein naturally found in some grains including wheat, barley, and rye—to improve vitiligo symptoms. A 2021 review suggested that a gluten-free diet may be effective in managing celiac disease, and it is hypothesized that vitiligo may be managed with similar dietary adjustments.¹¹ Studies have shown that celiac disease and vitiligo—both autoimmune conditions—involve IL-2, IL-6, IL-7, and IL-21 in their disease pathways.^12,13 Their shared immunogenic mechanism may account for similar management options.

Upon review, 2 case reports were identified that discussed a relationship between a gluten-free diet and vitiligo symptom improvement. In one report, a 9-year-old child diagnosed with both celiac disease and vitiligo saw intense repigmentation of the skin after adhering to a gluten-free diet for 1 year.¹⁴ Another case study reported a 22-year-old woman with vitiligo whose symptoms improved after 1 month of a gluten-free diet following 2 years of failed treatment with a topical steroid and phototherapy.¹⁵

Seven of 31 (23%) web pages suggested that individuals with vitiligo should include wheat in their diet. There is no published literature discussing the relationship between vitiligo and wheat. Of the 31 web pages reviewed, 10 (32%) suggested including whole grain. There is no relevant scientific evidence or hypotheses describing how whole grains may be beneficial in vitiligo.

Minerals—Eight of 31 (26%) web pages suggested including zinc in the diet to improve vitiligo symptoms. A 2020 study evaluated how different serum levels of zinc in vitiligo patients might be affiliated with interleukin activity. Fifty patients diagnosed with active vitiligo were tested for serum levels of zinc, IL-4, IL-6, and IL-17.¹⁶ The results showed that mean serum levels of zinc were lower in vitiligo patients compared with patients without vitiligo. The study concluded that zinc could possibly be used as a supplement to improve vitiligo, though the dosage needs to be further studied and confirmed.¹⁶

Vegetables—Eleven of 31 (35%) web pages recommended leafy green vegetables and 13 of 31 (42%) recommended spinach for patients with vitiligo. Spinach and other leafy green vegetables are known to be rich in antioxidants, which may have protective effects against reactive oxygen species that are thought to contribute to vitiligo progression.^17,18

Nuts—Walnuts were recommended in 11 of 31 (35%) web pages. Nuts may be beneficial in reducing inflammation and providing protection against oxidative stress.⁹ However, there is no specific scientific literature that supports the inclusion of nuts in the diet to manage vitiligo symptoms.

Comment

With a growing amount of research suggesting that diet modifications may contribute to management of certain skin conditions, vitiligo patients often inquire about foods or supplements that may help improve their condition.¹⁹ Our review highlighted what information was available to the public regarding diet and vitiligo, with preliminary support of the following primary diet components: vitamin D, vitamin B₁₂, zinc, and omega-3 fatty acids. Our review showed no support in the literature for the items that were recommended to avoid. It is important to note that 27 of 31 (87%) web pages from our online search were not authored by medical professionals or dermatologists. Additionally, many web pages suggested conflicting information, making it difficult to draw concrete conclusions about what diet modifications will be beneficial to the vitiligo community. Further controlled clinical trials are warranted due to the lack of formal studies that assess the relationship between diet and vitiligo.

Internet platforms have become a common source of medical information for individuals with a broad range of skin conditions including vitiligo. The prevalence of vitiligo among US adults ranges from 0.76% to 1.11%, with approximately 40% of adult cases of vitiligo in the United States remaining undiagnosed.¹ The vitiligo community has become more inquisitive of the relationship between diet and vitiligo, turning to online sources for suggestions on diet modifications that may be beneficial for their condition. Although there is an abundance of online information, few diets or foods have been medically recognized to definitively improve or worsen vitiligo symptoms. We reviewed the top online web pages accessible to the public regarding diet suggestions that affect vitiligo symptoms. We then compared these online results to published peer-reviewed scientific literature.

Methods

Two independent online searches were performed by Researcher 1 (Y.A.) and Researcher 2 (I.M.) using Google Advanced Search. The independent searches were performed by the reviewers in neighboring areas of Chicago, Illinois, using the same Internet browser (Google Chrome). The primary search terms were diet and vitiligo along with the optional additional terms dietary supplement(s), food(s), nutrition, herb(s), or vitamin(s). Our search included any web pages published or updated from January 1, 2010, to December 31, 2021, and originally scribed in the English language. The domains “.com,” “.org,” “.edu,” and “.cc” were included.

From this initial search, Researcher 1 identified 312 web pages and Researcher 2 identified 314 web pages. Each reviewer sorted their respective search results to identify the number of eligible records to be screened. Records were defined as unique web pages that met the search criteria. After removing duplicates, Researcher 1 screened 102 web pages and Researcher 2 screened 76 web pages. Of these records, web pages were excluded if they did not include any diet recommendations for vitiligo patients. Each reviewer independently created a list of eligible records, and the independent lists were then merged for a total of 58 web pages. Among these 58 web pages, there were 24 duplicate records and 3 records that were deemed ineligible for the study due to lack of subject matter relevance. A final total of 31 web pages were included in the data analysis (Figure). Of the 31 records selected, the reviewers jointly evaluated each web page and recorded the diet components that were recommended for individuals with vitiligo to either include or avoid (eTable).

For comparison and support from published scientific literature, a search of PubMed articles indexed for MEDLINE was conducted using the terms diet and vitiligo. Relevant human clinical studies published in the English-language literature were reviewed for content regarding the relationship between diet and vitiligo.

Results

Our online search revealed an abundance of information regarding various dietary modifications suggested to aid in the management of vitiligo symptoms. Most web pages (27/31 [87%]) were not authored by medical professionals or dermatologists. There were 27 diet components mentioned 8 or more times within the 31 total web pages. These diet components were selected for further review via PubMed. Each item was searched on PubMed using the term “[respective diet component] and vitiligo” among all published literature in the English language. Our study focused on summarizing the data on dietary components for which we were able to gather scientific support. These data have been organized into the following categories: vitamins, fruits, omega-3 fatty acids, grains, minerals, vegetables, and nuts.

Vitamins—The online literature recommended inclusion of vitamin supplements, in particular vitamins D and B₁₂, which aligned with published scientific literature.^2,3 Eleven of 31 (35%) web pages recommended vitamin D in vitiligo. A 2010 study analyzing patients with vitiligo vulgaris (N=45) found that 68.9% of the cohort had insufficient (<30 ng/mL) 25-hydroxyvitamin D levels.² A prospective study of 30 individuals found that the use of tacrolimus ointment plus oral vitamin D supplementation was found to be more successful in repigmentation than topical tacrolimus alone.³ Vitamin D dosage ranged from 1500 IU/d if the patient’s serum 25-hydroxyvitamin D levels were less than 20 ng/mL to 3000 IU/d if the serum levels were less than 10 ng/mL for 6 months.

Dairy products are a source of vitamin D.^2,3 Of the web pages that mentioned dairy, a subtle majority (4/7 [57%]) recommended the inclusion of dairy products. Although many web pages did not specify whether oral vitamin D supplementation vs dietary food consumption is preferred, a 2013 controlled study of 16 vitiligo patients who received high doses of vitamin D supplementation with a low-calcium diet found that 4 patients showed 1% to 25% repigmentation, 5 patients showed 26% to 50% repigmentation, and 5 patients showed 51% to 75% repigmentation of the affected areas.⁴

Eleven of 31 (35%) web pages recommended inclusion of vitamin B₁₂ supplementation in vitiligo. A 2-year study with 100 participants showed that supplementation with folic acid and vitamin B₁₂ along with sun exposure yielded more effective repigmentation than either vitamins or sun exposure alone.⁵ An additional hypothesis suggested vitamin B₁₂ may aid in repigmentation through its role in the homocysteine pathway. Although the theory is unproven, it is proposed that inhibition of homocysteine via vitamin B₁₂ or folic acid supplementation may play a role in reducing melanocyte destruction and restoring melanin synthesis.⁶

There were mixed recommendations regarding vitamin C via supplementation and/or eating citrus fruits such as oranges. Although there are limited clinical studies on the use of vitamin C and the treatment of vitiligo, a 6-year prospective study from Madagascar consisting of approximately 300 participants with vitiligo who were treated with a combination of topical corticosteroids, oral vitamin C, and oral vitamin B₁₂ supplementation showed excellent repigmentation (defined by repigmentation of more than 76% of the originally affected area) in 50 participants.⁷

Fruits—Most web pages had mixed recommendations on whether to include or avoid certain fruits. Interestingly, inclusion of mangoes and apricots in the diet were highly recommended (9/31 [29%] and 8/31 [26%], respectively) while fruits such as oranges, lemons, papayas, and grapes were discouraged (10/31 [32%], 8/31 [26%], 6/31 [19%], and 7/31 [23%], respectively). Although some web pages suggested that vitamin C–rich produce including citrus and berries may help to increase melanin formation, others strongly suggested avoiding these fruits. There is limited information on the effects of citrus on vitiligo, but a 2022 study indicated that 5-demethylnobiletin, a flavonoid found in sweet citrus fruits, may stimulate melanin synthesis, which can possibly be beneficial for vitiligo.⁸

Omega-3 Fatty Acids—Seven of 31 (23%) web pages recommended the inclusion of omega-3 fatty acids for their role as antioxidants to improve vitiligo symptoms. Research has indicated a strong association between vitiligo and oxidative stress.⁹ A 2007 controlled clinical trial that included 28 vitiligo patients demonstrated that oral antioxidant supplementation in combination with narrowband UVB phototherapy can significantly decrease vitiligo-associated oxidative stress (P<.05); 8 of 17 (47%) patients in the treatment group saw greater than 75% repigmentation after antioxidant treatment.¹⁰

Grains—Five of 31 (16%) web pages suggested avoiding gluten—a protein naturally found in some grains including wheat, barley, and rye—to improve vitiligo symptoms. A 2021 review suggested that a gluten-free diet may be effective in managing celiac disease, and it is hypothesized that vitiligo may be managed with similar dietary adjustments.¹¹ Studies have shown that celiac disease and vitiligo—both autoimmune conditions—involve IL-2, IL-6, IL-7, and IL-21 in their disease pathways.^12,13 Their shared immunogenic mechanism may account for similar management options.

Upon review, 2 case reports were identified that discussed a relationship between a gluten-free diet and vitiligo symptom improvement. In one report, a 9-year-old child diagnosed with both celiac disease and vitiligo saw intense repigmentation of the skin after adhering to a gluten-free diet for 1 year.¹⁴ Another case study reported a 22-year-old woman with vitiligo whose symptoms improved after 1 month of a gluten-free diet following 2 years of failed treatment with a topical steroid and phototherapy.¹⁵

Seven of 31 (23%) web pages suggested that individuals with vitiligo should include wheat in their diet. There is no published literature discussing the relationship between vitiligo and wheat. Of the 31 web pages reviewed, 10 (32%) suggested including whole grain. There is no relevant scientific evidence or hypotheses describing how whole grains may be beneficial in vitiligo.

Minerals—Eight of 31 (26%) web pages suggested including zinc in the diet to improve vitiligo symptoms. A 2020 study evaluated how different serum levels of zinc in vitiligo patients might be affiliated with interleukin activity. Fifty patients diagnosed with active vitiligo were tested for serum levels of zinc, IL-4, IL-6, and IL-17.¹⁶ The results showed that mean serum levels of zinc were lower in vitiligo patients compared with patients without vitiligo. The study concluded that zinc could possibly be used as a supplement to improve vitiligo, though the dosage needs to be further studied and confirmed.¹⁶

Vegetables—Eleven of 31 (35%) web pages recommended leafy green vegetables and 13 of 31 (42%) recommended spinach for patients with vitiligo. Spinach and other leafy green vegetables are known to be rich in antioxidants, which may have protective effects against reactive oxygen species that are thought to contribute to vitiligo progression.^17,18

Nuts—Walnuts were recommended in 11 of 31 (35%) web pages. Nuts may be beneficial in reducing inflammation and providing protection against oxidative stress.⁹ However, there is no specific scientific literature that supports the inclusion of nuts in the diet to manage vitiligo symptoms.

Comment

With a growing amount of research suggesting that diet modifications may contribute to management of certain skin conditions, vitiligo patients often inquire about foods or supplements that may help improve their condition.¹⁹ Our review highlighted what information was available to the public regarding diet and vitiligo, with preliminary support of the following primary diet components: vitamin D, vitamin B₁₂, zinc, and omega-3 fatty acids. Our review showed no support in the literature for the items that were recommended to avoid. It is important to note that 27 of 31 (87%) web pages from our online search were not authored by medical professionals or dermatologists. Additionally, many web pages suggested conflicting information, making it difficult to draw concrete conclusions about what diet modifications will be beneficial to the vitiligo community. Further controlled clinical trials are warranted due to the lack of formal studies that assess the relationship between diet and vitiligo.