Red artifact blob shows up in the middle of my screen when there are dark colours showing

Does anyone know what this is? Or why it is happening? There is a red blob-ish artifact that is on the middle of my screen and you can notice it when there are dark colours on the screen. It's really annoying when I'm trying to watch movies or play games that have dark scenes. (The picture quality isn't that great, but you can kinda see the red blob I'm talking about.)
Any thoughts?

I'm having the same problem. Only noticed it after installing OS X Lion.

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