mongolian spot
A benign, flat, congenital birthmark, with wavy borders and an irregular shape. The color is caused by melanocytes, melanin-containing cells, that are usually located in the surface of the skin (the epidermis), but are in the deeper region (the dermis) in the location of the spot.
MONDO:0005093
skin disorder
is_a
Mongolian macula
exact
blue sacral spot
exact
congenital dermal melanocytosis
exact