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. Dark Patches Inside Mouth: 7 Alarming Causes Liv Hospital A collection of resources for RACGP exams Next Gen GP Text Book live webinars AKT and KFP questions Metastatic oral malignant melanoma transformed from pre existing pigmented lesions in mandibular gingiva: Report of an unusual case ScienceDirect