I would just try and forget it. I got my phone back from repair and there is a particle right at the bottom of the screen. Didn't notice it at first, but once I did I kept looking at it and it annoyed me. I could have sent back, but in reality it really is insignificant and only me that can see it because I'm so anal about my phone.
Now a few weeks later I have learned to stop looking at it and ignore it and doesn't bother me any more. Just try and forget about it.