Despite their reputation, warts most often do not behave in a contagious fashion. It is true that viruses cause them, but people with warts on the foot do not generally get them on the hands and face, although most people wash daily and touch different body parts. The fact that you have them on hands and feet is an unimportant coincidence. This is counterintuitive (not what you'd expect); nevertheless, it's true.
Some warts multiply, while others stay just as they are. This has more to do with the particular viral strain than with whether they were touched or treated.
If you leave warts alone, they will eventually go away.
I very much doubt that the bumps you have on your scalp and face are warts. To be certain, you will need to show them to a doctor.
As to whether to treat your hand and foot warts, that's up to you. It may take a few sessions of freezing or burning, or else you can wait them out. What you don't have to do is be afraid to touch the rest of your body for fear of spreading them.
Best.
Dr. Rockoff
I still have one wart on my toe that will not go away with the OTC stuff, but I'm going to keep working on it. Once you have had the virus, apparently you are more susceptible to catching it again, so I guess all you can do is be careful.
Thanks Doc for your great advice. It kept me calm until I could go have a doctor look at the problem in person.