My DS has had such bad nappy rash in the past. He had thrush and rash on top of that so unfortunatly I couldnt tell you what thrush looks like. The ONLY way I was able to keep him nappy rash free was to use cloth nappies. Honestly, he has such a nice bum now! Maybe he was sensitive to the stuff in disposables, im not sure but I know that i didnt change them as often as I do with cloth nappies.