Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer Pigmented skin lesions The BMJ Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update Pigmentation Document Gale OneFile: Health and Medicine 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.