An oral melanotic macule is a harmless dark spot found on the lip, most often the lower lip, or inside the mouth, either on the gums, inside the cheek, or on the roof of the mouth. An oral melanotic View of Malignant melanotic nerve sheath tumor with PRKAR1A, KMT2C and GNAQ mutations Free Neuropathology Skin Lesions in Melanoma and Kaposi's Sarcoma Journal of Clinical Oncology Melanotic sarcoma growing from the mucous membrane of the lip and upper alveolar border of the jaw SuperStock Frontiers Case report: A rare case of massive peripheral nerve melanotic schwannoma and review of the literature