The cause of rash in infancy needs to be judged according to the child’s clinical symptoms and the nature of the rash. Generally, the common causes of rash in children are allergic urticaria, in which the child will have a rash like a wind ball, accompanied by obvious itching, which may be related to the child’s allergy to a certain object, and can be given anti-allergy treatment, and to avoid letting the child scratch, scratching the skin caused by infections. There are also infections that cause rashes in children, such as colds, measles, rubella, infantile emergency rash, chicken pox, scarlet fever, etc. All of these are caused by viral or bacterial infections that result in rashes on the child’s body, and most of these rashes are accompanied by a fever, for example, in infantile emergency rash, the child will have a high fever for three days repeatedly, and then the fever subsides and the rash gradually fades away without leaving any traces. Therefore, if your child develops a rash, it is important to make a comprehensive judgment and go to the hospital if necessary.