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. The Prevalence of Oral Pigmented Lesions among Sample of Dental Students. Pigmented Lesions of the Oral Mucosa Pocket Dentistry Pathology Outlines Melanotic macule Oral Melanotic Macule MEDizzy Labial melanotic macule