An oral melanotic macule is a harmless dark spot found on the lip, most often the lower lip, or inside the mouth, either on the gums, inside the cheek, or on the roof of the mouth. An oral melanotic Pigmented Lesions of the Oral Cavity Oral and Maxillofacial Surgery Clinics Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update Oral Melanotic Macule MEDizzy 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