My iPhone's screen is having a problem?

Hi, I have brought a nearly new iPhone 4S after using it for 1 month. It has shown a problem. The screen is having decolouration…

So why did it happened?
And how can I fix it

You can't fix it, we don't know why it happened because we don't have your iPhone… Therefore, we can't diagnose it for you… Your best bet would be to take it to an apple store

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