This dark spot on the patients back was confirmed to be a mildly atypical compound melanocytic naevus. , What does this mean?, A mildly atypical compound melanocytic nevus is a benign Oncology Letters A classification chart of skin disorders, categorized into melanotic Download Scientific Diagram Figure 1 from Categorization of Non Melanoma Skin Lesion Diseases Using Support Vector Machine and Its Variants Semantic Scholar Benign melanocytic naevi 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.