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How to recognise melasma
Melasma appears as broad, soft-edged patches of brown or grey-brown, usually symmetrical — both cheeks, both sides of the forehead, above the upper lip, along the jaw.
Symmetry is the clue. Sun spots arrive as discrete individual marks in whatever pattern your sun exposure happened to take. Post-acne marks sit precisely where blemishes were. Melasma drapes across the face in mirrored patches.
It is far more common in women, in skin that tans easily, and during and after pregnancy, hormonal contraception, or hormone therapy. It is also more common in the humid mid-Atlantic summer than many people expect.