Yellow marks on my iphone screen?

My screens been cracked for a while I'm about to get it fixed but recently some yellow colored stains have appeared on it. Can I get rid of it? Why are they there?

In my honest opinion, I think you should go to your nearest electronic store (Apple Store, etc.). See if someone could help you with your problem, or at least tell you how to fix it professionally.

I don't think you can fix it by yourself. I'd say they're there because of the cracks. Because it was open, it got stained like that. Maybe after it was open to something that could do that.

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