Small white square appearing on screen

Yesterday I was looking at my iPhoto pictures and every picture had 2 small white squares appear on the screen which I tried to edit. Only to find this morning I now have one white square appearing on the Mac book pro screen. I cannot get rid of it.

Please can anyone advise me how to remove it and what is causing it?

Thanks

Carol

MacBook Pro with Retina display, iOS 7.0.4

Posted on Jan 31, 2015 6:39 AM

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Small white square appearing on screen

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