Ds is 8 and scratches at the skin on his face so that he ends up with scabs. He'll leave them for a day or two so that they start to heal, then pick at them again, so they look raw. It's getting worse in that at first it was only one or two, but now there are about half a dozen. We made a deal last week that if he left them alone for a week he could get a computer game he wanted (he didn't have enough Christmas money left for it, so we agreed to pay the difference if he left his face alone), but he didn't last two days. I'm worried they might get infected, or leave scars, and I've tried to explain that to him, but he doesn't seem bothered. I've asked him why he does it, but he doesn't know. What can I try next? He's a bit old for a sticker chart (especially as his younger brother has just gone back to one), but I'm considering saying he can't play on his console on days when his face is red. Any ideas what we should be doing?