a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram 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 Definition of melanocytic macules associated with Peutz Jeghers syndrome NCI Dictionary of Genetics Terms NCI Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer