Why are there little yellow pixels on my screen?

Lately, my Macbook Pro's display has been acting up. There's these little yellow squares that keeping popping up on my screen while scrolling through something. They then disappear as soon as I scroll up or down again or open a app, tab, etc... does anyone know what might be causing this and know what would be the best way to stop it from happening?
thanks.

I'm having the same problem! And just today I noticed little black squares in Mail. Prior to today, the little squares had been yellow and had been limited to web browsers and PDF readers. I called this into AppleCare 6 months ago, and we did a system restore. After that didn't fix it, I took it into an Apple Store, and they said it wasn't the hardware. I called AppleCare today and they told me it sounded like corrupted files. We did a disk repair through Disk Utility and everything seemed to be OK until I just opened Safari and got a bunch of little black squares before my home page loaded. So far no more yellow squares, but only time will tell...

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