Growing black spot on iphone 5 screen?

My iPhone 5 screen has a black spot growing on the display, I want to know what is the cause or What i can do to fix it.
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Growing black spot on iphone 5 screen - 1

Either fungi growing underneath the screen or a wicked baby spider gathering.

At one point or another you dropped your phone and it damaged the pixels, and it will progressively get worse.

You broke the inside of you screen by either pressing to hard or dropping it too often. This often happens to my schools calculators.

The Retina Display is broken. If you have another iPhone 5 /5s/5c you can go to the apple store so they can change the broken display to the good one from the old iPhone. If you don't have an old iPhone 5 you would have to go and buy a new display at the apple store or an authorized resseller

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