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 What Causes Black Lump Inside Mouth? Liv Hospital This lovely patient was thrilled with her beautiful result after laser treatment of oral melanotic macules. I share this case to educate: laser treatment requires accurate diagnosis, an understanding Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer