Definition: Melanoderma or melasma characterized by the occurrence of extensive brown patches of irregular shape and size on the skin of the face and elsewhere; the pigmented facial patches if confluent are also called the mask of pregnancy, and are associated most commonly with pregnancy and use of oral contraceptives.
[G. chloazō, to become green]
See Also: melasma
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Examples: glitazone, GI cocktail, etc.