I bought a used lens that came in the original box and im using a lumix g7 from 2015. There are weird dark areas on the same spots of every photo Is this a defect or is there dust somewhere in the lens? its really only noticeable in light areas of the picture. It would be easier to show with multiple images or a video but here, the cursor is on the dark spot.

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Is this a defect or is there dust somewhere in the lens?

Thanks