What are you doing with scabs? I would cover them with gauze (so they can breathe/heal) but attach the gauze with painful adhesive so you wouldn't like taking it off.

If I'm bored/have nothing to do, I get into trouble probably because I don't want to think about certain subjects. Go looking for what you don't want to know/think about? That might stop the picking in its tracks. Make the choice of what you get to do if you catch yourself picking something you really don't want to do.