机体受不断变化的周围环境的影响,皮肤是首当其冲的。因此,一些环境因素(如紫外线照射)在皮肤癌的病因中可能起一定作用,这是不奇怪的。皮肤还是排泄和贮存器官,吸入或食入的某些致癌物质(如砷)贮存于皮肤或通过皮肤排泄时对皮肤可能产生致癌作用。发病率:各国皮肤癌的发病率有差别,不同种族间亦不一致(受遗传因素和皮肤色素多少的影响)。因此,某一地区的发病率的高低,受环境因素和易发病人口多少的影响。皮肤癌的种类:皮肤癌大多数起源于表皮,鳞状细胞癌来自角朊细胞(Keratinoyte),基底细胞癌来自靠近表皮-真皮接合部的基底细胞,黑素 The body is the first to suffer because of the changing environment. Therefore, it is not surprising that some environmental factors (such as ultraviolet radiation) may play a role in the etiology of skin cancer. The skin also excretes and stores organs. Some carcinogens (such as arsenic) that are inhaled or ingested may be carcinogenic to the skin when stored on the skin or excreted through the skin. Incidence rate: There is a difference in the incidence of skin cancer in different countries, and it is also different between different races (influenced by genetic factors and the number of skin pigments). Therefore, the level of morbidity in a certain area is affected by environmental factors and the number of people who are vulnerable to the disease. Types of Skin Cancer: Most skin cancers originate in the epidermis, squamous cell carcinomas are derived from keratinocytes, and basal cell carcinomas are derived from basal cells near the epidermis-dermis junction. Melanin