congenital dermal melanocytosis

Full Definition

Congenital dermal melanocytosis refers to benign birthmarks characterized by blue, blue-gray, or blue-black patches caused by melanocytes located in the dermis. These lesions are most common in individuals of Asian, African, Hispanic, and Native American ancestry, affecting up to 90% of these populations. They typically appear on the lumbosacral area but can occur anywhere on the body. Most fade significantly during childhood, though some may persist into adulthood.

Usage

Usage note: Preferred term replacing the outdated and potentially offensive 'Mongolian spot' or 'Mongolian blue spot'.

In Context

• "The extensive congenital dermal melanocytosis covered the entire lower back and buttocks." — Neonatal assessment report
• "Documentation of the congenital dermal melanocytosis was important to differentiate from potential abuse-related bruising." — Medical record note