S.S.
Most likely culprit is a virus. I know we have the same virus going around my daycare, I have sent 2 kids home this week w/the same thing. The dr's office said to get some Butt Paste and plain maloxx antacid and mix the 2 apply to rash. The malox apparantly helps the acidic content of the pooh & urine & the Butt Paste has zinc oxide to help heal the rash. If you cannot find Boudreaux's Butt Paste, Triple Paste works really well too. They are both kind of spendy but they work.