The fever of toddler emergency rash usually lasts for 3~5 days, and the fever is mostly high, the temperature can be more than 39.0℃, but there are individual differences. Childhood emergency rash is a common disease in pediatrics, mostly seen in infants and young children, is caused by human herpes virus infection, the course of the disease can be repeated fever, some babies may have convulsions, lymph node swelling or mild diarrhea and other phenomena. For such babies, the fever is mostly high, the body temperature can exceed 39.0 ℃, repeated fever lasts for 3 to 5 days, after the body temperature is normalized, the rash appears, rose-red maculopapular rash, the condition is alleviated, such as no complications can be quickly cured. However, there are individual differences, such as the course of the disease fever did not exceed 39.0 ℃, or fever for more than 5 days. It is recommended that young children with fever or rash be seen by a specialist for a comprehensive evaluation and appropriate management.