I hear that the bacteria IN The Shoe itself can cause some of these problems. Are you wearing really cheap shoes? You must be sweating alot in them and they are too tight. Get really comfy shoes 1/2 size larger so your feet can breathe. Wear really light socks not those heavy ones as your feet will get hot and sweat. Get some baking soda or baby powder and put some in your shoes. Change your socks everyday. See how that works.