My camera on my 4S has very tiny small stuck pixel on the sensor. It is visible only on dark photos and the place where it appears is not the worst possible. I am sure it is not a screen fault as long as I can see it only when turn my camera on and on some of my dark photos. Here is how it looks like: Do you think I should go for replacement as long as this is the only issue I have with my phone? What is your advise?