COM March 2009 Diagnosis UW School of Dentistry 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 Melanosis Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer Prevalence and clinical features of pigmented oral lesions Hassona 2016 International Journal of Dermatology Wiley Online Library