到冬天,有的人手上或脚上会发生一片片的红肿,红肿的地方有刺痛、发痒或是发热的感觉,这就是一种常见的、也是比较轻的冻伤,通常叫做冻疮。假如在很冷的天气里,手脚保护不好,露在外面很久,还可以发生比较严重的冻伤,把皮肉冻烂或者冻坏,甚至使身体残废。为什么会发生冻伤呢?因为寒冷对人体组织可以产生两种坏的作用,一种是使细胞冻结 In winter, some people may have a piece of redness on their hands or feet, and there is a tingling, itchy or fever feeling in the inflamed areas. This is a common and relatively mild frostbite usually called frostbite. If in cold weather, hands and feet protection is not good, exposed outside for a long time, you can also occur more serious frostbite, the skin frostbite or frozen, or even disability. Why frostbite it? Because the cold on human tissue can produce two kinds of bad effect, one is to freeze the cells