My5 year old son got a rash on his backside in ear...

My5 year old son got a rash on his backside in early October 2015. We initially thought it might be ring worm and we used tinactin. It didn't cure it. Then we had his Children's doctor look at and she prescribed an anti fungal. We used that for a couple of weeks - nothing. The rash remained and even got worse. Then they prescribed a stronger anti fungal. A couple of weeks later, the rash had even gotten worse. Then we went to the dermatology clinic at Childrens. They prescribed a fairly strong steroid. That made this child very moody and unhappy. When we told the Dr at the dermatology clinic that using that all over his backside had a very dramatic effect on his behavior, we were poo pooed and told that it would not be absorbed systemicly. Then when I looked it up on the web, there were specific notes in the literature about how using it over a large are on children could affect their behavior. Hmmmm. And, after a couple of weeks using this, it didn;t work. So then they prescribed two weeks of antibiotics. It just didn't go away. This is almost March 2016 and his backside is red, rashy, itchy and burns from all the scratching. Not real happy with their lack of knowledge, or lack of care about this. It hurts this kiddo every day.