This has been going on a while, but seems to be getting worse. Whenever he doesn't get his own way, or he even thinks he isn't going to, whenever I move him away from a hot oven or stop him slamming drawers for example he will scrab or grab huge chunks of hair. Mostly to me and his dad, also my mum who looks after him while I work.
I have dealt with it so far by saying quite loudly and in a firm way 'No, you don't hurt' and then saying ' be gentle, gentle' while stroking my face or his to demonstrate. I have no idea really if this is the right strategy. He has so far only done this to adults not other children and I don't know how I would deal with that if he did.