In the United States,<unk>  affects 17 million people.  It is most common during adolescence, affecting more than 85% of teenagers, and frequently continues into adulthood.
Acne vulgaris epidemiology and demographics
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Psoriasis epidemiology and demographics
Eczema epidemiology and demographics
Alopecia epidemiology and demographics
Herpes simplex epidemiology and demographics
Acrodermatitis chronica atrophicans epidemiology and demographics
Impetigo epidemiology and demographics