I discovered I had a blister on bottom of foot between baby toe and next toe on Friday when the top of my foot, above blister area was swollen, red, and painful. My husband noted blister had already popped and removed the dead skin. I am using antibiotic cream to site and elevating as much as possible yesterday. Site is still swollen, redness is less intense in color, pain is less when elevated. How long should I continue this treatment before becoming more concerned?