D.W.
I have not used this combination, but my daughter has had some really nasty rashes and over the counter diaper rash ointments just weren't doing the trick. There were two things that really worked. One is only sold at the pharmacy across from the old Hospital (at 380 and Graves). It's called Super Duper Diaper Goo (or something like that). I do not know if you need a prescription for it.
The other you can get at Walgreens. It's called Bag Balm Ointment. (http://www.walgreens.com/store/product.jsp?CATID=100951&a...) It was designed to prevent cows from chapping in the cold Vermont environment. After I stopped laughing about it, I tried it and found it does indeed work.