The Skin as a Mirror of Internal Disease: Comorbidities and Epidemiology of Acne Vulgaris and Adult Female Acne - A Cross-sectional Study and Current State of Knowledge.

Acne vulgaris is a common skin condition affecting an increasing number of adults and might be a clue to identifying systemic disease. Objective of this study is assessment of the demographic and clinical characteristic, including comorbidities, of patients with acne with a special focus on adult female acne (AFA). This cross-sectional study analyzed the medical records of 354 patients with acne (323 outpatients and 31 hospitalized). Data concerning patient age, sex, lesions morphology and distribution on body areas, duration of the disease, Body Mass Index, and dermatologic and systemic comorbidities were collected. 61% of all patients were female, 45.37% of women were classified as AFA. The median age of patients with acne was 24 years and 32.5 years for AFA. The face was the most commonly affected area; patients with AFA had lesions on their back than less frequently non-AFA. Predominant eruptions were pustules and papules. 38.7% of patients had concomitant systemic chronic disease, 15.25% had an endocrinologic disorder, and 6.21% had thyroid gland dysfunction. Women with AFA had endocrinologic disorders more frequently (P=0.002), whereas cutaneous signs of hyperandrogenism were observed less frequently than in the non-AFA group (P=0.034). AFA possess distinct clinical features and it should raise suspicion towards possible underlying endocrinologic disturbance.