G.P.
If it ends up being yeast (after going to the doctor), there is a cream I would try. My son had a diaper rash and they did everything from steriods to a compounded diaper cream. I finally used Motherlove Thrush and Diaper Cream, and he cleared right up. We now always use it as his diaper cream and a nipple cream for me. While he will get the red marks on his thighs, after one or two changes with the cream, it is gone.