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 Melanotic Macule An Unusual Occurrence In Gingiva Journal of Health and Allied Sciences NU ICD 10 CM Diagnosis Code K13.79 Other lesions of oral mucosa Pigmented Lesions of the Oral Mucosa Pocket Dentistry Labial Macules: Dark Spots on the Lip Dermatology Advisor Labial melanotic macule. B). Increased numbers of me lanocytes along Download Scientific Diagram