Estimates of the overall prevalence vary considerably and depend on the study populations and epidemiological methodology used. The disease is probably best defined by a continuum of severity, along which all members of the adolescent population are placed; it is estimated that up to 30% of teenagers have acne of sufficient severity to warrant medical treatment.1 An increasing number of women in their twenties develop late-onset acne and surveys of adults over the age of 25 years have reported prevalence of 22% in males and 40% in females.2,3
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