IPhone 6 buttons bulging out?

Like the iPhone power button ( the aluminum and button) look like someone pushed it out and it's the same to the low volume button does anyone know what the cause of this could be

Overheated battery from a malfunctioning charger, perhaps?

I had a battery do that on an old Samsung flip phone. Nearly popped out by itself it got so bloated. Given the integral battery of the iPhone… I could see that sort of thing happening.

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