I have been keeping my iPhone 6S+ in a spigen air capsule case since day one. Recently, I took my phone out of the case to admire it and noticed this. It looks like the paint coating the plastic cutouts for the bottom antennae have smudged? They could be scratches as well, but I really have no way of telling. I have tried running the area with damp cloth but they don't seem to be coming off. Has anyone experienced a similar issue? It doesn't really affect me, but it's annoying nonetheless now that I know it's there. And I am wondering if those marks are there despite me using a case, or because of it?