Was going to suggest the same as Alphagetti - clotrimazole works wonders. Using it now on a child in my care. Parents said he is prone to yeast infections and yes he is raw, red, bleeding. This was prescribed by the doctor. You want the one that says it is for athlete's foot, ring worm or jock itch - not the one that says for vaginal yeast infection in a woman because it is external not internal. It won't be in the baby aisle. Also the store brand works just as well for cheaper.

The doctor can also prescribe a similar cream that is basically a mixture of clotrimazole and cortizone but must be used sparingly. There is also something called Butt paste that is fantastic.