There are many reasons why children get a red rash on their face after a fever, which may be caused by external factors, early childhood emergency rash, drug allergies and other reasons. 1. External factors: when the child has a fever, the indoor temperature is higher or wear more clothes, so that the body secretes too much sweat, after stimulating the skin, can lead to the symptoms of children after fever face rash. 2. Acute rash in toddlers: The main feature of acute rash in toddlers is that the rash appears after the fever subsides. The rash appears when the fever subsides or when the fever is about to subside, and the rash is a reddish colored patchy rash or maculopapular rash. 3. drug allergy: children with fever symptoms, if you are taking or injecting drugs for treatment, the child for a certain component of the drug allergic reaction, will cause the symptoms of children’s fever face rash. There may be other reasons for children to have a red rash after a fever, it is recommended to go to the hospital in time for relevant examinations, to clarify the cause of the disease, under the treatment of a professional physician to carry out targeted treatment, to avoid aggravation of the condition.