Neurocutaneous Melanosis (Neurocutaneous melanocytosis) Dermatology Advisor Amelanotic Melanoma: Symptoms, Outlook, and Treatment Pigmented Lesions and Melanoma Plastic Surgery KeyPlastic Surgery Key Despite the name "melanosis," the pigment isn't melanin. The Pigment: It is actually lipofuscin, a "wear and tear" pigment. The Process: Anthraquinone laxatives cause apoptosis (cell death) of the colonic epithelial cells. Melanocytic Nevus: What Is It, Causes, Signs and Symptoms, and More Osmosis Melanocytic nevi and melanoma: unraveling a complex relationship Oncogene