Figure 225 from Pigmentations of the Oral Mucosa and Facial Skin Semantic Scholar Oral Mucosal Melanosis IntechOpen Oral Mucosal Melanosis IntechOpen 05 May 03 Eng 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 Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis