H.G.
Apple cider vinegar!! It works well. My son had one that woldnt go away and he put apc on it at bedtime. We would put it on a cotton ball and put a bandaid over it and it took about a month but it killed it and it never came back. We did try the duct tape instead of a bandaid and it irritated his skin so we stopped. We tried the otc freezes and all that and it was expensive and didn't work. That's another high five fir the magical works of vinegar!!