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.
As I said, young man (not sure why we need identifiers but I will play along). I asked my GP and he said 1 shot is fine. He even agreed that after the 5th time it was getting ridiculous. That particular doctor was scamming. Oh and wart was on the bottom of my foot so who cares about scarring.