Acne active ingredients.

The active ingredient of the product consists of any of the following: (a) Benzoyl peroxide, 2.5 to 10 percent. (b) Resorcinol, 2 percent, when combined with sulfur in accordance with § 333.320(a). (c) Resorcinol monoacetate, 3 percent, when combined with sulfur in accordance with § 333.320(b). (d) Salicylic acid, 0.5 to 2 percent. (e) Sulfur, 3 to 10 percent. (f) Sulfur, 3 to 8 percent, when combined with resorcinol or resorcinol monoacetate in accordance with § 333.320. [75 FR 9776, Mar. 4, 2010]