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 What Caused These Multiple Hyperpigmented Macules of the Mouth? Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Figure 1 from Oral melanotic macule a case report. Semantic Scholar Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis