Pigmented macular lip lesion Clinical Advisor 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 Summit Enlighten Laser to treat labial melanotic macules on the lip before and after. Facebook melanotic macule by joud aljuhani on Prezi Does anyone know what this black mark on my lip is? Started last August so it's I've had it nearly a year, was living in Spain at the time for 6 months