Thanks for the input.
These are Plain Warts
(Verruca plana), caused by a type of human papilloma virus.. Frequently these are very resistant to treatment and return, especially after cryofreezing as some virus may escape unfrozen, or some, already seeded, may come out later. In some persons, they go away by themselves after a few years.
You can try electrocautery, which is more effective in such cases. Get rid of them immediately as they appear, or you may get recurrences as new lesions will have started developing beneath if you keep them for long. Never scrub your skin, as this will help in spreading the virus.
At home you can also try wart removal solutions like salicylic acid solutions(e.g.Duofilm), these should be applied very carefully to the lesions only, protecting the surrounding area with vaseline. Apply for 3-4 days, then scrape off the dried surface with blade( be careful not to cut the skin!). Repeated 3-4 times this should get rid off most lesions. Treat bumps as they appear.
If you need further clarification, please ask. __________________________________
My answer is for your personal information only. It should not be used as a substitute to visiting your doctor. No treatment should be tried without first consulting a doctor.