Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 A Case Report of Oral Malignant Melanoma: A Silent Killer Cureus AD :: Annals of Dermatology 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. melanotic macule by joud aljuhani on Prezi