need advise: infection under breast/skin folds...

Having had under-breast problems for years, I found remarkable relief by wearing a BreastComfort Sling - an extremely soft cushion with wicking fabric which elevates the breast to keep the irritated skin from reinfecting itself.  I wear it as often as I can, particularly when I sleep.  I no longer have itching or burning beneath my breasts and I've been able to dispense with cortisone creams and lotions entirely.  I can't recommend it enough! I know there are similar products for overhanging stomachs  perhaps for skin folds under buttocks as well.  

I would get it documented, so that down the road you might be able to get your insurance to pay for the skin removal.  I get them all the time pre-surgery, and one thing that works for me is diaper rash cream.  I have also used the anti-monkey butt, and that works well too!!

Good luck!