2.5 yo DS grazed his chin at nursery last week. It scabbed over as usual, but he's started peeling strips of scab and skin off, and now has a large open raw patch on his face. He did it again with a tiny scratch on his cheek, so he's got two raw oozing wounds on his face and he just won't leave them alone! We put plasters on them but he pulls them off after maybe half an hour, and he's now made the chin wound so big plasters won't cover it. They both started off as really minor grazes! Anyone got any advice, short of tying his hands behind his back? It hurts when he pulls bits off and he cries, but it doesn't make him stop!