top right corner heats up while screen is on with screen problems

During normal usage my iphone SE's screen is having some grey lines over the texts all of a sudden and the front of the top right corner heats up badly within 10 seconds the screen is on, then the touch screen isn't quite responding, sometimes there are even some stripes.

I read that the screen problem might be fixed by detaching the cable, cleaning it a bit and reconnecting it (correct me if i am wrong), but I am more worried on the heating up part.

Anyone has an idea on this whole problem i am having? Thank you in advance.