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We studied in acne vulgaris of Korean adolescence by inspections and questionaires. We examined 4,766 of male and 4,178 of female, aged 10 to 21. Maximal prevalence rate was observed in the group of 20 years old male (84.4%) and 18 years old female (50.4%). Generally, prevalence rate and severity in male ere higher than female. Female, however, had higher prevalence rate than male before 14 years of age. The mean age of onset was 15.9 1.4 in male and 14.9 1.5 in female. The earliest age with acne eruption was 11 in male and 10 in female. The extensive acne was observed to be more common in male than in female. The highest prevalence of more severe form than Grade 2 (clinical acne) was observed in male of 16 years old group (67.9%) and in female of 14 (16.1%). The course of acne vulgaris was 12 year earlier in female than in male. Acne vulgaris in Korean was milder, lesser common, and had later development than in Caucasoid.
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