Hmmm - mine looks like that too - I had put it down to the fact that it had been down to previous ownership......not sure how old yours is but as I understand it warranties are less helpful in their third year - not sure where they no longer help though.
seeing some signs of it on my black one but only on the handle that had been fitted with the replacement door last Xmas so can't really claim it under warranty. I seem to recall there was a lot of discussion about this "problem" last year. Maybe a certain batch of cars?
Check the paint laqueur on any sharper edges, especially VXR front bumpers. I've now seen two where the laquere is flaking off the paint. Paint quality seems to be an Achilles heel.