Only the arch of my foot is the skin hanging of like a large blister i did not hurt the feet ?

Blisters: Is it possible that your got a blister from shoe pressure or walking bare foot? Regardless, blisters are often treated with betadine. It's a brown liquid that is sold in most drug stores and works as both an anti-biotic and a drying agent. Do not use if you have an allergy to iodine. Just dab a small amount onto a cotton ball and gently apply to the blister. Once a day for 2-3 days.