there are several options, the least expensive is to try a topical solution like Podofilox. Supposedly it's available at Walgreens
drug stores without a prescription. I bought an identical product for a friend in Mexico for $6. Aldara prescription cream for warts is ridiculously expensive, so unless you can get it at a huge discount try Podofilox first. There are other options like freezing them off, etc., but that requires a doctor visit.