Melanocytic Lesions A Guide to Clinical Differential Diagnosis of Oral Mucosal Lesions Continuing Education Course dentalcare.com Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer Diagnosis of oral pigmentations and malignant transformations ScienceDirect 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