discolouring on apple macbook?

so I've had my macbook for about three weeks now, and I've just noticed there's a slight discolouration on the edges,
where I'd rest my wrists/hands.
I googled it and found that loads of other people have had the same problem, so it's not like I've not taken care of it properly.
anyway, I found an article from 2006 saying apple recognised it as a problem and the new ones wouldn't have this problem.
but if that was four years ago, and mine's new, why is mine having this problem? and what can I do?
I understand that this happens, but after a few weeks?
if it was a year or so, then yeah.
 
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