Rx for acne on the back and chest
OTC there are a variety of Benzoyl peroxide soaps (Panoxyl Bar (R) etc) that can be used in the shower or bath for mild to moderate acne. Leave-on benzoyl peroxide products are useful but will bleach colored fabric. Oral and topical antibiotics are also useful and require prescription. The most effective treatment is Isotretinoin, a 20 week closely supervised, prescription program which requires birth control in childbearing aged women.