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. Mucosal melanosis image Esophageal Melanosis: An Unknown Entity Cureus Melanotic macules of the tongue in a newborn Journal of the American Academy of Dermatology Figure 2 from Oral melanotic macule a case report. Semantic Scholar