I have a white round spot about one inch in diameter on my monitor; how can i get rid of it?

I have a white spot, about one inch in diameter, on my iMac monitor.  It does not go away even after I restart the computer.  What is the cause and how do I get rid of it?

It has now disappered after I had shut down the computer.  It was opaque and oval.  All applications so it must have been a monitor problem.  Thanks.

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