Pigmented macular lip lesion Clinical Advisor Melanocytic Nevi MD Searchlight Morphology of melanocytic lesions in situ Scientific Reports 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 A melanocytic nevus (also known as a "Banal nevus," and "Nevocytic nevus") is a type of lesion that contains nevus cells Stock Photo Alamy