常见于下唇,为鳞状细胞型,多见于皮肤较白、受阳光辐射较长者。黑种人皮内棘细胞层有黑色素,有保护作用,故此病较少,可发于各年龄中,但以老年为多。90％为男性户外工作者。上唇鳞癌在许多方面为不同的疾病,男女比例为5:1,恶性程度较大,50％有早期、广泛的淋巴结转移。最常见者为基底细胞癌,原发于皮肤。临床表现开始为疣状结痂疮,或为发硬裂缝,经久不 Common in the lower lip, squamous cell type, more common in white skin, longer exposure to sunlight. The melanocytes of the black species have melanin, which has a protective effect. Therefore, the disease is rare and may occur in all ages, but it is mostly old age. 90% are male outdoor workers. Upper squamous cell carcinoma is a different disease in many aspects, the ratio of male to female is 5:1, the degree of malignancy is large, and 50% has early and extensive lymph node metastasis. The most common is basal cell carcinoma, which is primary in the skin. The clinical manifestations began as verrucous knot acne, or as a hard crack, prolonged