New uses for benzoyl peroxide: a broad-spectrum antimicrobial agent.

Benzoyl peroxide is a useful agent in the treatment of acne, chronic ulcers, tinea pedis, and tinea versicolor, probably because of its antimicrobial power. 2.5% concentration is almost as active as 5%. Although potential irritancy and allergic reaction have not been a problem on the face, benzoyl peroxide should be used judiciously in chronically inflamed or ulcerated skin. Several potential uses are mentioned.