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. Melanosis uberis in a pig Becker Melanosis (Becker Nevus) MD Searchlight Benign melanocytic naevi Dermoscopy. Benign melanocytic lesions Freckles, Lentigos, Melanocytic Nevi, and Melanoma Springer Nature Link