Bad pixel-what does it look like

I have two small spots on my 20" cinema display. They are irregular in size and dark. What are they?

It is helpful to inspect for bad pixels using a test pattern program like the following:
http://www.versiontracker.com/dyn/moreinfo/macosx/23237
Usually bad pixels will show up better using solid primary color screens. This is because it is usually an individual sub-pixel that fails, meaning just one color will fail among the Red, Green and Blue sub-pixel that makes up every "white" pixel.
If the spots on your screen are always dark and irregular in shape but still small, like the size of a text period symbol, then it could be some kind of contamination or particle inside the screen. Good luck.

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