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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.
Bluish discoloration of the skin: Cyanosis is a bluish discoloration of the skin or mucous membranes caused by lack of oxygen in the blood. See detailed information below for a list of 38 causes of Bluish discoloration of the skin, Symptom Checker, including diseases and drug side effect causes.