I think I see what you're saying. I exchanged my first S6 because of a fairly sizable piece of dirt / dust / lint floating behind the camera glass. It never entered the lens area, but the way it shifted it could end up there any day. Even the smallest piece of dust could effect pictures, even if you can't see it. I suggest if it shows up in every picture, exchange it for another S6. Regardless if it is something floating behind the glass or a defect in the camera itself, I'd exchange it.