Strong chemical peels containing glycolic acid, salicylic acid, and other hydroxy acids can be used to treat acne scars. This method is usually used on your face, but it can work on back acne scars, too.
Back chemical peels use acids at different concentrations to heal back acne and fade hyperpigmentation. The basic mechanism by which they work is exfoliating the skin and removing the top layer of skin. The process signals skin cells to regenerate, which speeds up skin turnover, unclogs pores, evens out skin tone, and improves skin texture.