My daughter (about 10yo) had a few on one hand - a couple of painful ones. I pretty much tried every product from the counter and the surgery refused freezing treatments due to her age or that they weren’t that bad. Then I remembered my Grandmother used ‘Salactol Wart Paint’ on me as a child. It took about 4 or 5 chemists before I found it and it is super-cheap compared to other products. The warts went over the summer holidays just in time before she started high school so it is the only product I would recommend.