This happened to me twice, exact same spot and all. Both times it was not a defect with the screen, but actually the battery or hardware inside. Something caused the battery to swell, almost doubling in width. I had a verizon charger, which was suspected to be defective and somehow causing this to happen, that i used exclusively for both batteries. but i still have yet to figure out if that is what caused the swelling or if it was something els within the phone. I also needed a new charging port sometime after the first swollen battery, which tells me that there is a good chance it was the charger. if anyone els has had the swollen battery as the cause of their screen popping out and had a verizon (black block/ not the iphone charger) charger please respond as i am curious as to what the cause is.