Pigmented Lesions of the Oral Cavity Oral and Maxillofacial Surgery Clinics 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 Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Pigmented Lesions of the Oral Mucosa Springer Nature Link