A custom back peel can reveal a brighter, smoother and more refined complexion and also improve the overall look and feel of the skin in just one treatment. Back 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. Typically, an acid is left on the skin for 3-5 minutes, then neutralized and removed.