Labial Melanotic Macule Diagnosed by Dermoscopy Labial melanotic macule A collection of resources for RACGP exams Next Gen GP Text Book live webinars AKT and KFP questions 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 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