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It sounds that the wart simply blistered following the freezing. This is just the body's reaction to the freeze injury. It should settle down with time. The freeze treatment is intended to kill the virus infected cells which cause the warts in the first place. Sometimes it takes more than one treatment though. The fluid may have some infectious potential but I suspect much less than what you fear. (The fluid from the blister will not likely cause multiple warts on you or likely spread the warts to the members of your family.) You might try adding some betadine to the blistered areas.(use this sparingly however as too much may delay healing). A little betadine will probably help to slow the clear fluid and protect from infection.
I hope this information helps. Further questions are welcome if you have others. If my answer has been helpful and to your satisfaction then please remember to press the "ACCEPT" button. Thank You and Best Regards,
Anthony Bray MD