Its in the lower right corner, I think I just noticed it. I spilled a drink on it last night and I wasn't sure if that was the reason, so I put it in rice over night but that didn't do anything. It only REALLY shows up on white backgrounds, and the touch still works there, but yeah. Its like a a blob, no real rhyme or reason to it, and its not even a full blob, like the center of it has parts that aren't dark.