Melanotic Macules, Naevi, and Melanoma Springer Nature Link 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. Pigmented (Purple or Brown) Lesions in the Mouth Pigmented (Purple or Brown) Lesions in the Mouth Kazemi Oral Surgery Facialart.com Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update