Congenital lingual melanotic macule: an underreported entity? European Journal of Pediatric 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 ORAL MELANOSIS leading to the diagnosis of HIV infection. Despite being a weak association, any unexplained oral pigmentation in a high risk individual should make one suspect HIV associated oral melanosis and proceed Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update