I just had some work done on a wart I've had for over a year. The doc said that he's had luck with this procedure: local anesthetic, "stab" at it with a needle, and duct tape over it for 3-4 weeks, no peeking. He explained that the "stab" in a sense riles up the immune system and gets it to attack the wart.

But I'm still not sure what the duct tape does that medical tape can't!