Oral Melanotic Macule: Symptoms and Treatment Skinsight Any idea what's on my lips? : r Blackskincare 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 Lesions of the Oral Mucosa Pocket Dentistry Melanotic macules of the tongue in a newborn Journal of the American Academy of Dermatology