Genital Angiokeratomas in Adult Men and Women: Prevalence and Predisposing Factors.

INTRODUCTION: There is a paucity of prevalence data for genital angiokeratomas in adults. The objective of this article is to determine prevalence of genital angiokeratomas in adults as a function of sex, age, and race/ethnicity. METHODS: A cross-sectional study was conducted over 11 months during 2013 and 2014 using a convenience sample of adult men and women consenting to genital examination during melanoma screening and surveillance by a senior dermatologist in an outpatient clinic. The analysis was conducted from April through December 2016. RESULTS: Of 213 white/European American adults examined (127 men and 86 women), genital angiokeratomas were detected in 30.0% (64/213). Presence of at least one genital angiokeratoma was significantly associated with male sex (odds ratio [OR], 2.4; 95% confidence interval [CI], 1.3-4.5; P < .001) and age older than 50 years (OR, 3.4; 95% CI, 1.7-6.7; P = .008). CONCLUSIONS: Genital angiokeratomas are relatively common in adults of white/European American origin and important to recognize because of their benign nature and occasional confusion with other tumors.

Prevalence and Gross Morphologic Features of Perianal Melanocytic Nevi.

Importance: The presence of numerous melanocytic nevi is a significant melanoma risk factor, but there are scant data related to prevalence and morphologic features of melanocytic nevi in the perianal area. The prognosis of perianal melanoma is often dismal because of hidden location and diagnosis delay. Objective: To determine prevalence and morphologic features of perianal melanocytic nevi. Design, Setting, and Participants: This study was conducted for 11 months during 2013 and 2014 at an outpatient dermatology clinic in Chicago, Illinois, with a convenience sample of 236 adults (men and women of all races, ≥18 years) presenting to 1 dermatologist for melanoma and/or skin cancer screening or surveillance. The analysis was conducted during April through July 2015. Main Outcomes and Measures: Prevalence and morphologic features of perianal nevi according to race/ethnicity, sex, and age. Results: Of 236 participating patients, 219 were non-Hispanic white; 4, Hispanic white; and 13, nonwhite. Patients included 138 men and 98 women, ages 23 to 84 years (median age, 55 years; mean [SD], 53 [15] years). Perianal nevi of any size, at least 2 mm in diameter, and at least 5 mm in diameter were evident in 48.9% (107 of 219), 39.7% (87 of 219), and 5.5% (12 of 219) of non-Hispanic whites, respectively; 50.0% (2 of 4), 0 (0 of 4), and 0 (0 of 4) of Hispanic whites, respectively; and 38.5% (5 of 13), 38.5% (5 of 13), and 0 (0 of 13) of nonwhites, respectively. In non-Hispanic whites, the presence of at least 1 perianal nevus was significantly associated with history of atypical nevus excision (odds ratio [OR], 2.9; 95% CI, 1.5-5.7); and extant findings of at least 1 atypical nevus (OR, 2.2; 95% CI, 1.3-3.9); atypical nevus pattern (≥20 nevi that were ≥2 mm in diameter), plus at least 5 nevi that were 5 mm or greater in diameter (OR, 1.8; 95% CI, 1.1-3.1); and at least 4 atypical nevi 5 mm or greater in diameter (OR, 1.9; 95% CI, 1.1-3.3). Conclusions and Relevance: In this study, perianal melanocytic nevi were common and were associated with prominent and atypical nevi elsewhere. The perianal area is worthy of attention during melanoma screening and surveillance.