I've had this problem continuously for at least 4 years.?!

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It's called a plantar wart, I had a cluster of them and they are stubborn, I got rid of mine accidentally, by ripping it off when I was removing some duct tape. I wouldn't recommend doing this yourself, since it is very painful and will probably cause you to lose quite a bit of blood, like I did. What I would recommend is going to the doctor and having it frozen, wait a couple of months and if it is still there then talk to your doctor about having it removed surgically.

http://en.wikipedia.org/wiki/Plantar_war…

I used to have a wart on my hand. It sounds like you have the same one that I had. I can't remember the name of it, but the way i got rid of mine is: there is a what looks like a little plate of skin underneath the wart. What I did to get rid of this it take a needle and pick that little plate out and it should go away. If it's the same as mine of course.

Hope this helps. I know they can be highly annoying.

usually duct tape fixes everything but you already tried that...