I can't really "diagnose" you since I'm not a doctor. But...
In the past I have gotten red, odor and itching and sometimes a little skin peeling comes with it. For me, it's a yeast infection. I put athlete's foot creme (per my doctor) everyday until it's gone and then if it comes back. For me it's because the area isn't getting enough dry time. I have prevented it in areas of my body by using deodorant there, but that is not a recommendation from my doc, so I don't know if that can cause problems (though I had none), so I'd say yes to prevent (but it doesn't get rid of it for me), but again you might want to check with your doctor! Unless it is brand new or preventative the powder doesn't work for me.
That said, you may want to ask your doctor. Good luck!