My mac has small gray lines under the screen.

They're only very visible under certain colors, especially grays and on the sign-in screen. I took a screenshot and they did not appear in the photo, so I took a photo with my phone so you can see what it looks like. The part I took a photo of is the worst (aka the most visible) part, but it stretches in a line across the whole screen. I only just noticed the line, but it's only noticeable with certain colors over it, so I'm not sure how long it's been there. I got my computer in December 2009, it's a 15 inch MacBook Pro.
Any idea what may be causing this and what I should do about it? It doesn't really bother me right now, but I'm worried it might be indicative of a bigger problem!

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