What is the cause of the green spot in this photoraph (Arrowed)?

I am using a Nikon 55-200MM F/4-5.6 AF-S VR DX Black Lens with a Nikon 52Mm Filter Nc Neutral Colour, using the lens hood that came with the lens.
I do not want to remove the filter, but this could be the cause. It appears in all sorts of pics, usually just off centre. It is not a reflection of a signal light.
Is there a way to stop it happening?
It happens on two cameras too.

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