Otc benzoyl peroxide. Over the counter lotions with benzoyl peroxide or salicylic acid will help back acne. Oral supplements with zinc and. Niacinamide may also help. For more resistant cases see dermatologist for prescriptions.
Antibiotic. Because the skin on the back is so thick, its difficult for topical medications to penetrate to a level in the skin that would be effective. Often an oral antibiotic is necessary.