Common types of moles Figure 1 from Categorization of Non Melanoma Skin Lesion Diseases Using Support Vector Machine and Its Variants Semantic Scholar Melanocytic Nevi (Moles) Fact Sheets Yale Medicine Benign melanocytic naevi Oncology Letters 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.