atypical-blue-nevus

All of these lesions are thought to arise as a consequence of impaired migration of melanomcytes from the neural crest to the epidermis. Lumbosacral congenital dermal melanocytosis (Mongolian blue spot, slate gray nevus) Congenital dermal melanocytosis presents as an often large, slate blue colored lesion most often affecting the lumbar & sacral-gluteal region but can…