Olivia used to get REALLY bad nappy rash (in Darwin, so I am partially attributing it to the humidity) which also flares up if she has too much yogurt. It got so bad and NOTHING was working, so I took her to my GP, as the rash started to develop sores on her bum cheeks and it was just awful....

He suggested we try plain old Canestan & this worked like a treat!

I think that nappy rashes appear for so many different reasons it really is trial and error & I hope you find a solution quickly.......