Oral Mucosal Melanosis IntechOpen Happy Wednesday! , In this video, a patients labial melanotic macule (a benign pigmented lesion) is being treated with liquid nitrogen. Labial melanotic macules are flat and asymmetrical with a a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram Ungual Melanotic Macules DoveMed Oral Mucosal Melanosis IntechOpen An oral melanotic macule is a harmless dark spot found on the lip, most often the lower lip, or inside the mouth, either on the gums, inside the cheek, or on the roof of the mouth. An oral melanotic