IPhone 6 getting very hot in top right corner?

I've gotten my iPhone 6 fixed a couple of days ago, my screen and LCD was destroyed. The staff fixed it, but told me my camera was broken also. I did not get my camera fixed, because I'm going to get it fixed later. My phone is getting very hot in the top right corner though. Any suggestions as to what is wrong with it?

It was apparently not properly repaired. Take it to Apple and have them look at it.