Fire ants ouch, have never seen them. You must have solved your athlete's foot before the blister stage. These are the little blisters i was talking about .. https://www.sutherlandpodiatry.com.au/wp-content/uploads/2016/03/tinea-1.jpg https://www.sutherlandpodiatry.com.au/blog/the-truth-about-athletes-foot/ Not the large blisters like you get from an ill-fitting shoe, tiny little ones. A match flame sterilized needle can prick them too. Then iodine. ;-)