any of a number of dark-bluish or mulberry-colored rounded or oval spots on the sacral region due to the ectopic presence of scattered melanocytes in the dermis. These congenital lesions are frequent in black, native American, and Asian children from 2–12 years, after which time they gradually recede; they do not disappear on pressure and are sometimes mistaken for bruises from child abuse.
Synonym(s): blue spot2
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Examples: glitazone, GI cocktail, etc.