New classification of melanocytic nevi based on : Expert Review of Dermatology 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 Congenital Melanocytic Macule of the Tongue in a Newborn Cureus Cutaneous and Oral Melanocytic Nevi: Background, Pathophysiology, Etiology