HELP!

My son is pinching and hitting! At first he would only hit me, but now he is hitting and pinching me! He won’t pinch anyone else but he has no problem hitting anyone and everyone with anything and everything he can get his hands on!

I do NOT believe in hitting so please keep those sorts of opinions/advice to yourself! I tell him no we don’t hit that’s not nice Mommy doesn’t like it we do nice touches! We don’t hurt people be love! I’ve tried raising my voice (not screaming or yelling) but a stern tone and that worked a few times but then he started doing it again! I have no idea what to do? Is this normal? Is this something I should bring up to his doctor?