I have raw red skin in areas of body including where the leg band of underwear hits, in the top area where buttocks split, and in and around my navel. In other words, everywhere that is a moist area and doesn’t have good air circulation. I’m approx 40 lbs overweight, and have type 2 diabetes, but no longer take metformin due to keeping numbers down. I use ointment prescribed by doctor which gets rid of it, but what causes it? I have a bad case now, although I have been doing a Keto diet for several weeks.