Does anyone know what are these strange bubbles on my friend's IPhone screen?

Are they air bubbles or dust? Is there any way to get rid of me?
(PS: my friend has an IPhone 13)
Does anyone know what are these strange bubbles on my friends IPhone screen?
Does anyone know what are these strange bubbles on my friends IPhone screen?
Does anyone know what are these strange bubbles on my friend's IPhone screen?
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