Its on the screen cover and I noticed it the second day I had it. I'm pretty sure that it must have been there from the beginning since I was very delicate with it from the beginning. I'm looking for recommendations on wether to exchange it in the 14 days (is that easy to do). It's the 2.8 model. It s pretty small but can catch light in and be more pronounced that way. I got the highest end model, do I deserve a scratch free case? Also, the display seems to be very good. No dead pixels and no easy bleeding that I can see coming from the bottom of the screen. Am I rare to be lucky in that regard or would I probably get the same result from a replacement? I was looking at one of the laptops in the retail store and definitely saw some bleeding from the bottom while looking at a white website. I purchased it from an apple store btw, not online.