Is numbness in fingers normal after treatment? How long will it last?

It is possible that a nerve in your arm was irritated during the coolsculpting process and as a side effect, you are feeling numbness in your fingers. Luckily, this will most likely revise itself and go away on its own, though I would mention it to your treating doctor. 

I am sorry to hear that you have numbness after CoolSculpting you have asked in excellent question regarding numbness.  This phenomenon is not uncommon when cool sculpting is performed in other areas.  It has always resolved.  I would expect your numbness should fully resolve.  Please let us know how you do.  Best of luck!

When CoolSculpting is performed on the arms, it is possible that one of the nerves (ulnar nerve) gets irritated during the treatment.  When this occurs, some numbness and/or weakness of the small and ring fingers is possible.  This issue should resolve completely over time.  Be sure your treating physician is aware of your problem so that your progress can be monitored.