The same thing happened to me actually! I brought it to an iDropped and they can probably fix it by removing and cleaning the screen, for over $100. I make sure it doesn’t bother me and save that money!
iPhone 8. I’ve only tried watching/wiping it off.
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Took my phone out of my pocket and I noticed a little bit of sweat. I wiped it off and now a couple of days later there is a spot on my screen that is only visible when locked. Any ideas if this is covered under warranty?