IPhone 4s yellow spot around right corner and bottom too?

What is this? Does this mean that the screws are screwed in too tightly? O ha d the screen replaced about a half year ago, and now these sellow spots suddenly appeared…

But when i put my iphone in freezer they disappear for a while a while until it gets hotter. Also when i press the screen i see blue lines and also yellow a little bit which i didn't have before the repair

Try google it also

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