Melanocytic Nevi MD Searchlight Preventing melanosis in shrimp Responsible Seafood Advocate Lentigo maligna and lentigo maligna melanoma Neurocutaneous Melanosis (Neurocutaneous melanocytosis) Dermatology Advisor Iris Melanosis in Cats: Causes, Symptoms, and Treatment Cats.com ORAL MELANOTIC MACULE (OMM) (Also called focal melanosis labial melanotic macule) A benign, localized, flat pigmented lesion of the oral mucosa Caused by a focal increase in melanin production