DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Mongolian blue spot. Blue patches on a baby's but- tocks. This birthmark (naevus), called Mongolian blue spot, is often mistaken for a bruise. The blue marks appear in patches of skin containing unusually high numbers of pigment-producing cells (melanocytes), and mostly occur around the lower back or buttocks. Mongolian blue spot affects about 80% of black or Asian babies, but only 10% of white babies. The birthmark is harmless and disappears by age 3-5.
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