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blue marks in dark areas of images

I have been having a lot of issues with blue marks appearing on my model's outfits and don't think it's a case of clipped shadows. One person reckons you cannot avoid it as it is just the camera highlighting dust on the model's clothes. What is causing the marks and is there a way to avoid the problem? See on and below model's breast. You can also see it in parts of the background. Any help would be appreciated.


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