Vitamin D ointment is great for diaper rash, in fact I think it's the best thing out there for skin irritation. It's a bit more difficult to find than zinc oxide diaper rash cream, but it's worth the hassle. It works immediately on my baby's skin.
The other day, I got a minor burn while cooking and realized that I had run out of the burn gel I usually use. So I reached for my daughter's vitamin D ointment. It actually worked just as well as the burn gel and got rid of the redness and pain. This ointment is definitely a keeper, everyone needs to keep one in their medicine cabinet.