Diarrhea after toddler emergency rash can usually improve significantly after treatment in about 4~5 days, and the exact recovery time is affected by a variety of factors and varies from person to person. Childhood emergency rash, also known as infant roseola, is caused by viral infection of a pediatric acute infectious diseases, clinically characterized by sudden onset of fever, heat withdrawal rash, can be complicated by diarrhea, vomiting, lymph node swelling and other symptoms. Most of the diarrhea complicated by acute rash in young children is self-limiting, with mild symptoms, which can be significantly improved in about 4-5 days after treatment. However, children who do not actively cooperate with the treatment, poor gastrointestinal function, poor diet during the period of illness, or a combination of bacterial infections can all lead to prolonged treatment. It is recommended that children with acute post-rash diarrhea seek prompt medical attention and active treatment to avoid adverse consequences.