Chemical back peels use acids in different concentrations to cure back acne and fade hyperpigmentation (blemishes). The basic mechanism by which they work is to exfoliate the skin and remove the top layer of skin. The process signals the skin cells to regenerate, which accelerates skin renewal, unclogs pores, evens skin tone and improves skin texture. Like a facial peel, although you will see improvement after one session, more sessions will be necessary to see the desired results.