They are very granular so just rub them off -- little by little. Two left bumps. I just used a razor I use for my legs. Just kept shaving it down until it was totally gone. Can't even see where it was. I had a huge one on my back. Completely gone with just rubbing. None of mine have come back and only one left a brown spot -- just a discoloration. Not a scar. Don't overthink it especially if they can become cancerous -- which I doubt.