My Daughter Keeps Breaking Out In Bad Blotches And Lumps

My daughter keeps breaking out in bad blotches and lumps all over her body. We have seen a gp twice and after the second visit he gave her prednisone to try. However this is no help at all and I think the problem is more complex. This has been ongoing for six months now and is getting worse. She has an outbreak today and she says it feels like severe sunburn.