Rash after low fever can be caused by a variety of reasons, generally considered toddler emergency rash, hand, foot and mouth disease, chickenpox and other causes; need to be based on the different causes of the patient by the physician, to take appropriate treatment measures and methods. 1. Acute rash in young children: caused by viral infection, typically characterized by fever and rash, that is, the child first fever, fever lasts for 2-3 days after the rash, the rash is generalized, can be accompanied by a runny nose, cough and other symptoms. 2. Hand, foot and mouth disease: caused by enterovirus infection, can be manifested as herpes on the palms, feet, buttocks, mouth with fever, cough and other symptoms. 3. Chickenpox: caused by herpes virus infection, which can be manifested as centripetal distribution of herpes, and patients can have fever with itching and other symptoms. Need to go to the hospital to diagnose the cause of the disease after treatment, can not be randomly used drugs.