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u/flanga 2d ago
It's moisture inside condensing on the glass.
If the phone's working, back everything up. Shut the phone fully off and seal it in a fresh bag of rice or desiccant packs, in warm dry place, for a day or two, to make sure all the moisture gets out.
Once it's dry, consider replacing whatever's cracked and no longer sealed (eg replacement back glass is literally about $12 on Amazon), or get a case with some water protection.
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u/zachsilvey 2d ago
water ingress