Allergic to Penicillin anyone?

This is my little nephew Gaven. Can you believe this? The poor little guy was on penicillin for an ear infection and found out he was allergic to it! It took like a week for the huge hives to go away and then it left big bruises where each one was. This was the saddest thing I've ever seen. Poor guy. They gave him some medicine but because hives are a reaction that is under the skin, they can't do a whole lot of treatment as far as topical creams go. Probably took 2 weeks for him to get all better.