I've had a single verruca directly on the ball of my foot for several years.
Its positioning means any patch or plaster doesn't last, even if I hobble about on the side of my foot all day or tape it on. I've tried various gels and freezing treatments, the surface peels off and I think "oh, it's gone!" but the fucking thing goes so deep. The best was the Scholl treatment pen, that stopped it being painful to walk on, I had a crater in my foot, and I really thought it had killed it, but the crater healed and it's still there.
NHS won't touch it, I can't afford to go private. Is there a treatment that actually works?