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. Lentigo maligna Wikipedia Genetics of melanocytic nevi Roh 2015 Pigment Cell & Melanoma Research Wiley Online Library Managing non melanoma skin cancer in primary care: A focus on topical treatments BPJ 57 December 2013 Melanotic and non melanotic malignancies of the face and external ear A review of current treatment concepts and future options ScienceDirect