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 Figure 1 from Oral melanotic macule a case report. Semantic Scholar Oral Melanoma: A Rare but Aggressive Oral Cancer Oral melanoma is a rare and highly aggressive malignant tumor that develops from melanocytes within the oral mucosa. It most commonly affects the 05 May 03 Eng Pigmentary Disorders Springer Nature Link Oral Mucosal Melanosis IntechOpen