Growing black dot on my iPhone 5s screen?

Just yesterdat my phone began to act weird and then colorful vertical lines appeared in my screen and now my screen is kinda fuzzy/hazy and now today in the morning I noticed a black dock in my screen and it just grew throughout the day, it's about the size of a nickel now. I wanted to know what can be the cause this problem? I never dropped it in water. So what's the cause of my problem? And what can I do to fix it?

Sounds like a broken display. It will probably have to be replaced.

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