An area at the center of the screen on my MBP remains light even when the display has gone to sleep. Should I be concerned?

I've just noticed that there's a roundish area at the center of my screen that never goes fully dark. If I turn the screen brightness right down, it's still bright, and if the display goes to sleep there remains a faint bright patch (If I put the computer to sleep the screen is completely dark).
Should I be concerned about this?
Thanks!

Boot from your install disc and test. If it still does it, you have a hardware issue. Contact Apple and get it serviced if you are still in warranty.   
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
Got problems with your Apple iDevice-like iPhone, iPad or iPod touch? Try Troubleshooting 101

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