My guess is duct tape doesn’t do anything special to warts but the adhesive and the tight seal causes you to shed a few layers of skin. Repeat for weeks until you have shed all of the wart containing layers and replaced them.
Salicylic acid ointment also works much better than cryo therapy. The same idea but probably a lot faster than duct tape, but also probably a bit more painful.
And in my experience, the band-aid style treatment worked much better than the kind you brush on. I guess just keeping it in place all day through hand washings, etc was what helped.
Salicylic acid ointment also works much better than cryo therapy. The same idea but probably a lot faster than duct tape, but also probably a bit more painful.