Comfrey, Marigold, or St. John's Wort creams can ease inflammation and blistering.
Bandage overnight with slices of raw onion and old bread liberally wetted down with vinegar.
Apply pure apple cider vinegar on the corn and immediately cover with baking soda (as much as you can pile on). Leave for 10 minutes, then wash off. Repeat 3 times daily until corn disappears (should work within 1 week).