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Epidermal Nevus MeSH Supplementary Concept Data 2025
Congenital lesions that affect about 1 in 1,000 people and appear at or shortly after birth as localized epidermal thickening with hyperpigmentation that frequently follow the lines of Blaschko (normally invisible lines of cell development in the skin that follow a "V" shape over the back, "S" shaped whirls over the chest, and sides, and wavy shapes on the head.). They can result from post-zygotic, somatic mutations in the KRAS, HRAS, NRAS, FGFR3, or PIK3CA genes. OMIM: 162900