Melanocytic Nevus: What Is It, Causes, Signs and Symptoms, and More Osmosis Iris Melanosis in Cats: Causes, Symptoms, and Treatment Cats.com Lentigo maligna Wikipedia Melanosis coli: a contrast effect or an oncogenic effect? A large scale retrospective cohort study International Journal of Colorectal Disease Springer Nature Link 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