Izzy went through a stage of cratching and pinching me - HARD! and it bloody hurt!
Nothing and I mean nothing would make her stop - i tried ignoring, moving her way, she would stop after a while but then do it again the next day!
So I smacked her hand! She was disgusted in me - gave me a filthy look and walked off to play with her toys - and it worked! She didnt do it again like she was doing
Occasionally now she will pull at my skin or hair- and I do think she is testing for a reaction, so I ignore it, pretend she hasnt done anything - if I said ow or whatever she'd do it again - but me doing nothing is boring and she stops!
SO yes I think he will get through it - but what you do to make him stop now is up to you - I hated smacking her and have never wanted to (and thankfully needed to) do it again, but I dont really regret doing it as it stopped her!