Philips dust ?



I bought myself and my mum a 32" and 28" Philips Widescreen TV about 2 years ago (different model numbers) . I've noticed that on both sets a circle about 6" in diameter has appeared in the centre of the screen. I thought it was dust, and it still might be dust, but it is in the inside of the glass. Anyone come accross this before and is it a job for a service engineer. Thanks.
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