AD :: Annals of Dermatology Vulvovaginal melanocytic lesions: a review Diagnostic Histopathology Figure 2 from Oral melanotic macule a case report. Semantic Scholar 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 Itchless, pigmented macules Clinical Advisor Dentistry and Medicine: Pigmentation and Discoloration of Oral and Facial Tissues