What are these lines on my iphone? I want them gone?

I was in the middle of posting a video onto Instagram on my iphone when these brown lines started to gradually appear on my screen. My phone then froze with these lines on it and I have restored/reset my iphone and these lines are faded however they are still there! Please help me, I didn't drop my phone or anything how can I make these go!

Contact apple, and don't listen to people like ahmed thy just think there cool because they can dis people from a computer screen. They just think that they are powerful.

I think that the best thing to do is take it either back to the store and ask if it can be replaced. Although you may not have dropped it, it can be because of faulty wiring when it was made. If it is because of that then they have to replace it because they have to keep the customer happy with the product. I had a similar problem with my phone, it wouldn't save any of my photos, music or anything. We took it back and they replaced it free of charge. The should be able to do the same with yours