My nephew has red, itchy raised bumps on his elbows and knees. was prescribed a steroid which didn't improve the rash, what could this be? he's 3

Itchy Rash: Red, Raised, Itchy bumps sounds like a description of hives. Usually oral steroids improve a hive-like rash. This type of rash can be brought on by recent viral infections, food ingestion or drug ingestion. There are, however, many causes of rash in a 3 year old child so seeing the rash would be helpful to assist in diagnosis. I would be happy to consult with your nephews mom as I am in Ohio.