Melanocytic Lesions Basicmedical Key Melena: What Is It, Causes, Symptoms, Bleeding, Treatment, and More Osmosis MELANOCYTIC DISEASES, MELANOMA and PATHOLOGY OF> Flashcards Quizlet 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 Melanocytic Nevus: What Is It, Causes, Signs and Symptoms, and More Osmosis Oral Melanotic Macule: Symptoms and Treatment Skinsight