Because the skin on your back is thicker than facial skin, postinflammatory hyperpigmentation—the dark spots that linger after a zit heals—in that area takes longer to fade, say Dr. Sherber. At the first sign of a spot, treat swelling and redness with salicylic acid (Clean & Clear contains 2 percent) to prevent scarring. If you’ve picked at it and have a stubborn older mark, apply a brightening serum to correct excess pigment. (SkinMedica’s can help fade your dark marks in as little as two weeks.)nbsp; 

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“It has a higher density of glands that produce oil and sweat than other areas of the body, making it especially prone to acne,”

says Noëlle Sherber, M.D, a clinical assistant professor of dermatology at George Washington University.