Black lines on iphone words?

The other day my iPhone 4s fell off of my bed and some whiting around the edges of my screen have occurred, also, along the words there's dark lines underlining and highlighting the words and symbols. The drop wasn't very far but ever since then the whiting seems to be getting worse. A few weeks ago i got the screen replaced and i read online that that could be a reason for the whiting but the black around the words I'm unsure of

The flex cable probably got somewhat disconnected. That's why the black lines occur. They should probably occur more when you apply pressure. If whoever fixed it for you isn't too douchey, they might put the flex cable back on. Not sure though.