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Melasma is a dark skin discoloration that occurs on sun-exposed areas of the face. It is generally characterized by a brown color over the cheeks, forehead, nose and/or upper lip. It is often symmetrical, matching on both sides of the face.
Patchy skin color is areas where the skin color is irregular. Mottling or mottled skin refers to blood vessel changes in the skin that cause a patchy appearance. Irregular or patchy discoloration of the skin can be caused by: Changes in melanin, a substance produced in the skin cells that gives skin its color.