There are thousands to millions of nerves in our hands. It is very likely that the cyst removal is the culprit behind the slight numbness. Also, an injury to the neck and/or back can cause numbness and tingling in our hands. If you've had a recent injury yo either or both, I would see a neurosurgeon about it & your right hand. If not, mention it to the dr who removed the cyst. Most likely, you'll simply have to ignore the numbness, as I do with mine. Good luck!!
I think if you had something done recently and are experiencing some numbness that it is plausible that a nerve may have been affected during the removal. However, how was the cyst removed? Often those are drained and not 'dug' out. What was the cyst and what type of doctor removed it? There is this to consider. https://www.healthline.com/health/ulnar-nerve-dysfunction#treatment I'd call the doctor that removed the cyst to ask if there could be an association. Let us know what say.