After the baby vaccination, there are many red spots on the body, this situation should be highly suspicious of vaccination reaction, many children after vaccination, there may be a rash, there will be fever, nausea, vomiting, poor mental status, diarrhea, etc., called vaccination reaction, this situation occurs in the day of vaccination or the next day, the form of this rash is a single, and there is no itchy The rash is single, without itching, and is a light red maculopapular rash, which usually subsides in two to three days. If the rash persists for a longer period of time, and obvious itching occurs, or the child is irritable, it is necessary to go to the hospital, and the possibility of vaccine allergy cannot be ruled out, it is necessary to carry out further tests, such as blood tests, to determine whether the child is allergic to the vaccine caused by the allergic reaction.