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Mongolian blue spots, a type of naevus (birthmark) on a baby's back. These feint blue spots are found singly or in groups on the lower back & buttocks at birth, when they may be mistaken for bruises. They are common in black or Asian children & are caused by a concentration of melanocytes, the cells which produce the pigment melanin, deep within the skin. They tend to disappear by the time the child is three or four years old.
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