Rash after high fever in children may be caused by diseases such as measles, scarlet fever, infantile emergency rash and so on. 1. Measles: the rash appears after 3~4 days of fever. It is mostly red maculopapular rash, which appears in the order of head, face, neck, trunk and limbs. In addition, it is accompanied by cough, photophobia and Koplik’s spots. 2. Scarlet fever: Most of the rashes appear in 1~2 days of fever, and there may be high fever at the time of rash. The skin is diffusely congested with dense pinpoint-sized papules, and the skin of the whole body can be involved, accompanied by peeling after the rash recedes. There may be sore throat, headache, prune tongue, swollen lymph nodes in the neck and other symptoms. 3. Acute rash in young children: fever for 3 to 5 days, body temperature up to 39 ℃ or higher, usually after the fever subsides, the rash is red maculopapular rash, distributed on the face and trunk, which can last for 3 to 4 days. Some children may have characteristic erythema on the soft palate. Children may also have eyelid edema, bulging fontanel, cough, diarrhea, convulsions and other symptoms. Children with high fever after the rash, should go to the local hospital to clarify the diagnosis, the professional doctor symptomatic treatment, need to comply with the doctor’s prescription medication.