颌面部色素痣在各种物理性、化学性、生物性、免疫性或遗传性等因素作用下可癌变，如发生基底细胞癌、鳞形细胞癌、黑色素瘤等等，这已成为共识。但同时恶变为两种肿瘤极少见，尤其是恶性黑色素瘤与基底细胞癌同时发生更为罕见，未见报道。本文就我科收治的该类病人进行报... Maxillofacial nevus in a variety of physical, chemical, biological, immune or genetic factors such as the role of cancer, such as the occurrence of basal cell carcinoma, squamous cell carcinoma, melanoma, which has become the consensus. But at the same time malignant transformation into two kinds of tumors is extremely rare, especially malignant melanoma and basal cell carcinoma occur more rarely at the same time, have not been reported. This article for our patients admitted to the class reported ...