Melanocytic Lesions and Disorders of Pigmentation Obgyn Key Melanocytic nevi Basicmedical Key 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 lesions displaying peripheral dots and globules may raise diagnostic uncertainty when identified beyond adolescence. This is a trunk lesion in a 46 year old patient with no personal history of melanoma. Would you Melanocytic Nevi, Including Atypical Nevi (Dysplastic Nevi, Nevus with Architectural disorder and Cytologic Atypia) Dermatology Advisor