Labial Lentigo (labial melanotic macule) Cancer Therapy Advisor Brown spots, especially on the lips, can be alarming to some. In some instances it can indicate rare oral mucosal melanoma, however in this case it was a non cancerous labial melanotic macule. Labial melanotic macule Mystery behind labial and oral melanotic macules: Clinical, dermoscopic and pathological aspects of Laugier Hunziker syndrome GPLC (glycine propionyl L carnitine) nutritional supplement molecule. Stylized skeletal formula (chemical structure). Atoms are shown as color coded c Stock Photo Alamy