Once healed, acne lesions can leave temporary red or purple marks than can give rise to dark marks called post-inflammatory hyperpigmentation, or PIH. While scars result from damage to the epidermis and the collagen, PIH is caused by damage to the cells that contain melanin.
A little restraint goes a long way when you’re tempted to pick, but if you find yourself with PIH, a vitamin C serum (try Janson Beckett Vitamin C&C Facial Serum) or lightening products with kojic or azelaic acid (Peter Thomas Roth Potent Botanical Skin Brightening Gel Complex has both) can improve the appears of these spots and help get your complexion back on track.
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