My iphone 11 heats up as well but it’s only on the bottom half of the screen. I don’t know wether i’d the battery but if it is it kind of scares me because it does get really hot, and I hope it doesn’t cause any hardware issues.
iPhone 11, iOS 13
I am not aware of the ambient temperature in your area --> Keeping iPhone, iPad, and iPod touch within acceptable ...
Low- or high-temperature conditions might cause the device to change its behavior to regulate its temperature. Using an iOS device in very cold conditions outside of its operating range might temporarily shorten battery life and could cause the device to turn off.
Heating issue
