Have some parent had experienced your child having roseola?

How high is the fever, and if the temperature keeps high during the rash, has been mistaken for an allergic reaction to an antibiotic taken before from a diagnose of an infection in the ear. My child has been taking amoxicillin prescribed by a doctor in the ER 6 days before, now has a rash but does not have a high fever, temperature of 99.5, her pediatrician says not to stop the antibiotic and now she has a rash, I called the pediatrician and now he wants to see my child at the office. Sorry for the grammatical errors but I do not know how to express my self in medical words.