My son who has never had nappy rash EVER came home from DayCare this afternoon red raw & I mean RED RAW to the point he has now been screaming on & off since he came home. Couldn't sit in the bath & cried when he did a poo. What can I do to help???

I've put on cream though screams when trying to do so...he went down at 7pm & has woken 3 times since absolutely screaming in pain. I've given panadol, what else can I do??