It could be a version of thrush... DD has really bad nappy rash at the moment and it is not typical thrush - well that is what the nurse said anyway. It is red and has blisters but I didn't notice the blisters because it just looked red if that makes sense. I don't know if DD was itchy because she is 4.5months old so can't tell me.

Normal nappy rash creams were not doing anything for it but I have used an antifungal cream on it last night and the reddness has gone down a lot and the blisters are smaller.

I am no GP or anything