Hello, my 4 year old boy broke out in hives yesterday and also says he has pain on his feet when he walks off and on throughout the day. This morning he looked better but by this evening he had more hives again with itching, even though I had been giving him Benadryl every 6 hrs. Is this normal, I was told it would take 2-3 days to go away but does it get worse before getting better? Thank you,