my son is 24 years old. About a month ago he had tonsilitis - the 4th time in the last 3 years. He was given an antibiotic - a cephlasporin. He started breaking out in a rash about a week before christmas. The rash is only on his hands, arms, legs and feet. It does not itch. He went to a doctor who thought it was the antibiotic and gave him a short of cortison and cortisone pills. It seemed to be drying up but when he was finished with the pills it started coming back. It looks like little red bumps - not a hive. What could this be.