Kindle Pin Hole of Light
I have the same problem.
It is a tiny pin size hole in the screen that lets bright light escape. It is more obvious with the light turned all the way up. This is most certainly a defect in the screen.
The Good: Amazon will allow you to return the defective Kindle.
The Bad: This is my 2nd Kindle with this problem. Both of the new Paperwhite Kindles I have ordered have had this problem. I am returning both of them.
I am a little annoyed that the Amazon rep I spoke to asked me 4 times in different ways if I had dropped the Kindle. I kept telling him that it came out of the box like this and it is NOT a crack but a hole. I am sure this is not the first time they have received calls about this so by now it is a known problem. I take issue with him returning to the same question that suggested I damaged the Kindle.