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and I've already gone to settings and turned screen lock on but it hasn't worked so what do I do?

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...