Black spot on my iphone 5 screen?

Hi. My iphone's display became really screwed up recently(screen became a bit pixelated, colors warping and display becomes hazy) but now there's this black spot that is slowly growing in size. What is it and can it be fixed?
Black spot on my iphone 5 screen

Looks like the screen is dying, i would take it to an apple store and ask them about it, only time i've seen that happen is when someone boiled their iphone. Has it got very hot recently?

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