Pigmented Lesions and Melanoma Plastic Surgery KeyPlastic Surgery Key Oral Melanotic Macule: Symptoms and Treatment Skinsight Oral Melanotic Macule: Symptoms and Treatment Skinsight How Can You Tell if It's Melanoma or Just a Mole? 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