White patches appearing on the screen after some time

I have bought an iMac recently. And for some days white patches like something occurring on my screen after sometime when I opens it. And the patches are there after closing it till sometime. So what can i do now? PLEASE help me .

That sounds like condensation forming between the display and front glass panel.
If you live in an area with high humidity, then might help to run a fan or dehumidifier to help reduce the moisture in the air.
It also might help to leave the iMac on and running for a day or so to compleatly dry out the trapped moisture.
If those steps do not help, then you may want to take the iMac to your local Apple Store or AASP and have them clean between the display and front glass panel. 
See > Apple - Support - iMac - Service FAQ

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