For Mongolian Spot we have terms and definitions in 2 topics. The topics are Baby and Medical.

Large bluish birthmarks, usually on the lower back or buttocks, more common in darker skinned babies. Usually fade or disappear as a baby grows.
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A brown to blue-black spot on the lower back and buttocks at birth, caused by a concentration of pigment-producing cells; usually disappears by the age of 3 or 4 years
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