Pathology Outlines Melanotic macule 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 Diagnosis of oral pigmentations and malignant transformations ScienceDirect Pigmented Lesions of the Oral Cavity Pocket Dentistry Oral surgery II: Part 4. Common oral lesions British Dental Journal