Acute rash is a common disease in pediatrics, body temperature over 39℃ may affect the body of young children, such as the emergence of convulsions, etc., need to reasonably reduce the fever, and at the same time, need to pay attention to identify other diseases that cause fever. Childhood rash is usually caused by the human herpes virus, is a common pediatric disease, mainly in infants and young children, clinical recurrence of fever, rash and other symptoms, usually in the fever 3 ~ 5 days, the heat out of the rash, the disease gradually recovered. If the body temperature exceeds 39℃, it may affect the body, such as abnormal discharge of brain cells due to the obvious increase of body temperature, and the symptoms of convulsions, so it is necessary to reasonably reduce the fever, such as the body temperature exceeds 38.5℃, use antipyretic medication (such as acetaminophen or ibuprofen) under the guidance of the physician and according to the baby’s weight to reduce the fever, and observe closely the decline of body temperature and mental state. For babies with recurring temperature, unsatisfactory drop in temperature with antipyretics, or poor mental response, it is important to identify other causes of fever, such as intracranial infections. It is recommended to consult a specialist for a comprehensive assessment and judgment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.