Congenital dermal melanocytosis (CDM), previously referred to as Mongolian spot, is one of the most commonly encountered newborn pigmented lesions. It is a benign, ill-defined, blue-to-gray patch present at birth or shortly after. CDM patches are commonly seen in the sacrococcygeal area in infants of Asian or African descent but may be found on any cutaneous surface in infants of all ethnicities. The pigmentation becomes most intense at 1 year of age, reaches its peak diameter by 2 years of age, and usually fades completely by adulthood.
CDM occurs due to the delayed disappearance of dermal melanocytes within the deep dermis.
Related topic: acquired dermal melanocytosis
Congenital dermal melanocytosis in Infant/Neonate
See also in: AnogenitalSynopsis
Codes
ICD10CM:
Q82.8 – Other specified congenital malformations of skin
SNOMEDCT:
40467008 – Mongolian spot
Q82.8 – Other specified congenital malformations of skin
SNOMEDCT:
40467008 – Mongolian spot
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Last Reviewed:08/27/2024
Last Updated:08/28/2024
Last Updated:08/28/2024
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Congenital dermal melanocytosis in Infant/Neonate
See also in: Anogenital
