BMJ Group Medical Reference
Your doctor can freeze off your warts using liquid nitrogen in a treatment called cryotherapy. You can have this treatment every one to three weeks depending on how quickly the area heals after each treatment and what happens to your warts.
Two good studies ( randomised controlled trials) found that cryotherapy worked about as well as treatment with acid.   After six weeks of either treatment, about two-thirds of people had got rid of their warts.  Warts came back in about one-third of people two months later, whichever treatment they had. 
It isn't clear whether cryosurgery works better than using an electrical current ( electrosurgery) to get rid of the warts. 
Cryotherapy can sometimes cause an infection, but this is rare. 
It is safe to have cryotherapy if you're pregnant.
randomised controlled trials
Randomised controlled trials are medical studies designed to test whether a treatment works. Patients are split into groups. One group is given the treatment being tested (for example, an antidepressant drug) while another group (called the comparison or control group) is given an alternative treatment. This could be a different type of drug or a dummy treatment (a placebo). Researchers then compare the effects of the different treatments.
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