Based on the photos it looks like there may be something pressing against the back of the LCD, causing distortion on the display. It may go away on its own, but even if it doesn't it shouldn't spread to the rest of the screen (I don't think). If you wanted to fix it, you'd have to open it up to try to remove the object pressing against the screen, but you're likely to do more damage than good, since this is fairly minor right now.
If the problem continues check back in with us and we may be able to help you fix the spot =)
Good luck!