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 What Is an Acquired Melanocytic Nevus? Melanocytic Nevi MD Searchlight Applications Instant Optical Evaluation Medical Guidelines 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. Melanocytic nevus Wikipedia