**when you are old, things munch on you** This are warts, pure and simple. If you work on one, then you see classic wart seeds, evenly spaced apart. These are colonies of viruses. I slowly scrape them with a fingernail, but it has to rough and sharp. A little scraping will bring in oxygen, and a bit of blood. Then put Polysporin on it, for the slight pain.
It can take weeks, but they are gone, and their friends will find another spot. I also use Tea Tree Oil, which is the old man's friend. You can scrape them with a drop of this oil, works quite well.