FDA's rules for over-the-counter acne medicines allow benzoyl peroxide at 2.5 to 10 percent, salicylic acid at 0.5 to 2 percent, and sulfur at 3 to 10 percent.
FDA rules for acne medicines
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What the sources say about acne
Acne is a common skin condition that happens when hair follicles under the skin become clogged.
Doctors and researchers believe that one or more of the following can lead to the development of acne: Excess or high production of oil in the pore; Buildup of dead skin cells in the pore; Growth of bacteria in the pore.
Illustration made for this page. The sample answer shows how Skinby words a result: a visual resemblance, not a diagnosis. Skinby never names serious conditions from a photo.