Most toddlers will usually only get the rash once, while a small percentage of toddlers may get it about two to three times. The main cause of the rash is the herpes virus types 6 and 7, and after having the rash, there will be persistent immunity, but a small number of children may have the rash two to three times, which is less likely. The onset of the rash may last from three to five days, and parents need to give fever-reducing medications such as ibuprofen and acetaminophen. All of the above medications are recommended to be taken under the guidance of a doctor and should not be used on their own to avoid adverse effects on the child’s body and to seek medical attention in a timely manner.