22month old ds had never had such severe nappy rash before. It has been going on for a couple of weeks and is so sore just in the cracks of his groin. I have tried sudacream which usually does the trick and he has his nappy off whenever possible, and sleeps a lot with no nappy at all at the moment. Also trying cloth nappies but nothing seems to help. What can I use? Any tips gratefully appreciated.