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Large congenital melanocytic nevus
- ... of the brain and spinal cord when the nevus affects a very large area Smaller congenital pigmented or melanocytic nevi are common in children and do not ...
- ... melanocytosis is the name of a kind of birthmark that is flat and blue, or blue-gray in color. They appear at birth or in the first few weeks of life. Dermal melanocytosis was formerly called Mongolian blue spots.