Generic Name: BENZOYL PEROXIDE - TOPICAL Pronounced: (BEN-zoh-ill per-OX-ide) Benzac Top Uses: This medication is used to treat mild to moderate acne. It may be used in combination with other acne treatments. When applied to the skin, benzoyl peroxide works by reducing the amount of acne-causing bacteria and by causing the skin to dry and peel. Benzac may also be used for purposes other than those listed here. Please consult your physician before taking any medication.