Lenticular melanotic macule on the lower lip of a Laugier Hunziker Download Scientific Diagram Labial melanotic macule Stock Image C057 2077 Science Photo Library Labial melanotic macule. B). Increased numbers of me lanocytes along Download Scientific Diagram 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.