I have a wart on top of my thumb i've tried to freeze it off repeatedly with over-the-counter wart removers but no sign of it even getting better?

Warts: Warts are hard to treat, and once over the counter treatment has failed then it time to see the Dr. for an eval for definitive treatment.

Wart removal: Use a single blade from a razor and exfoliate the wart as close to skin as you can (stop of bleeding or pain). Use freeze spray after it is trimmed. Then use several days in a row if compound W in wart. Compound w with wart shaving in a regimented consistent way should make warts go completely away.