Bitting Cat?

Could it be that someone has or is playing rough with him? Always play gentle with him. I never punish with my hands - if he bites, yelp and walk away - or give him a toy that he can bite on. Also when you play with him, as soon as he starts biting, stop playing with him and walk away - or put him in a room where he can't run after you and keep biting you. You might also try sparying bitter apple on your hands or feet...