By Gary M. White, MD
The Mongolian spot is a congenital blue patch caused by the presences of dermal melanocytes. Acquired dermal melanocytosis may occur as well.
A congenital blue-black patch on the sacrum of an infant with darker skin is most characteristic. Caucasians may also be affected. In a large study of babies in India with Mongolian Spots (MS), more than 40% of MS disappeared by 1 year. Multiple patches, extrasacral position, size larger than 10 cm, and dark-colored lesions were markers of persistence beyond 1 year [Pediatric Dermatology 30;6; 683–688, November/December 2013].
The lesion usually fades by puberty. It may persist however, into adulthood. No treatment is needed nor available. This is a benign lesion.
Two lesions in one. An aberrant Mongolian spot along with a nevus.
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