What to do when your child hurts himself on purpose?

this is not that un usual for a two yearold this is when they start to challange us and have fits / tantrums . mabey you could put him in a high chair or get him a fold up or kids table untill he stops doing this . When he does bang his lip take him to the room and tell him no let him sit in there untill he calms down . tell him before you go to the table if you hit your head you will be in the room .