What are the side effects of freon 114 used by dermatologist?

To whom, you or the dermatologist. He uses it to freeze off skin warts and anything else it may work on. It may be slightly damaging to the ozone layer but he does not use enough to harm himself or a patient who may inhale a bit. I am sure there is a label somewhere that says it is a known carcinogen in California, so don't use it there.