N.B.
Please don't scare yourself until you know you need to worry.(When you hear hoofbeats, think horse, not zebra.) Summer heat and humidity, itchy red rash----could be zebra(IBC), or it could just be a horse(yeast). Or even heat rash. Try a tiny bit of cortisone cream twice a day.You could put a tiny bit of yeast medicine (generic chlortrimazole, available everywhere in foot care) on top of the cortisone twice a day. It should look better almost immediately. If it doesn't, by all means, go to the Dr.