There is a white mark on the screen that looks like a scratch, but it's under the surface of the screen (LCD). I tried to take a screen shot but it doesn't show on that, so that should tell me something but I don't know what :8}

I think it is getting a little longer as time goes by (approx 1 cm) and it shows clearer on light/white backgrounds. In fact you can't really see it at all on black backgrounds, but the lighter it gets the clearer it becomes. If you open the actual attachment you should be able to see the mark

It's a Macbook Pro and I've had it for over four years so I'm looking to upgrade soon. But I'm just really curious as to what it is and if it's worth fixing, can anyone help?