Black dot on camera

Hello friends.

Last saturday (05/07/2011) I was taking a picture with my iPhone 3GS and I saw a "black dot" on my câmera, at first I thought it was dead pixels, but I realized that when I zoomed the photo that dot disappears, as well as when I get a picture of a very bright spot, like a lamp or the sunlight. So, now I think the glass that protects the camera lens is scratched, since a great amount of light pass thru the glass and the black dot disappears. Could you guys analyze the follow pictures? Perhaps if I polish the glass it will work, what you think?

The original one (Click to see larger):

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Zoomed:

Thanks for now.

Sorry if I made grammatical mistakes, I'm from Brazil 🙂