Hi, I think you are allergic, and need something strong.
I would say to the interviewer I can give handshake only with my left hand .
got biten long time ago under my watch when driving a motocycle ,by something very nasty(kind of very very long ugly bee) . My arm has doubled in size. I was allergic to this kind of insect.
my arm was red, went to the pharmacy, gave me what I needed, took 2-3 days off ,3 days after, it was much better.