Congenital dermal melanocytosis in Child
Related topic: acquired dermal melanocytosis
Q82.8 – Other specified congenital malformations of skin
40467008 – Mongolian spot
Differential Diagnosis & Pitfalls
- Child physical abuse – Childhood abuse affects children of all ages and economic and cultural backgrounds. It can often be challenging to differentiate findings attributable to child abuse from benign anogenital skin conditions. Abuse can present with purpura and ecchymoses: changes color from blue to green to brown over days to weeks, uneven pigmentation, tender to palpation. Documentation of congenital dermal melanocytosis may be helpful in avoiding any confusion.
- Congenital melanocytic nevus – Brown, well-defined, surface change (eg, papular lesions).
- Blue nevus – Usually much smaller, typically no more than 5 mm in diameter, well-defined.
- Nevus of Ito – Often speckled, progresses with age, located over the shoulder, clavicle, and scapular region.
- Nevus of Ota – Often speckled, progresses with age, located in the periorbital region.
- Venous malformation – Usually palpable, may swell or change in coloration when dependent or crying.
- Infantile hemangioma – Overlying telangiectasias, may swell or deepen in coloration when dependent or crying, rapidly elevates over days to weeks.