Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update Pigmented macular lip lesion Clinical Advisor Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer 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