I felt some acute pain while walking for a half-year or so. It was increasing over that time, so I went to the doctor. Doctor said it was a papilloma wart under the sole skin, so she cut off the skin with some milling cutter(no Idea what it is called in English) and then pour some acid (even the smoke was obviously visible!) into the wound. It was painful, but FAR from how I expected it to be.
Duct tape method works by suffocating the cells affected by the virus. The virus affected cells are already being isolated by your immunity system (why you have wart/callus) and it’s trying to restrict oxygen/food supplied to it through blood. The core of the wart (or root I think it’s called) needs air, so when you cover it, it tried to get closer to the surface instead of trying yo dig deeper.
When you combine the duct tape method with occasional scrapping of the skin and cleaning it, you can slowly get it off of you. Or sometime your immunity can do a better job during that situation and that slight push is enough to kill it off. That’s why it’s not guaranteed to work, but sometimes it works. And something you should try before using acid and other methods