I have a late 2008 MacBook Pro which I take very good care of. During the past month I've noticed that there are small scratches appearing in the aluminum at the edge of the right palm rest. I don't know how they happened, first I thought they were caused by my watch, but my watch is on my left hand (and I even take it off when using the computer)... Nobody uses this computer other than me and I always close the lid every single time I leave it. Is this normal? it is something I should go complain about?