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Can you provide more information? What are the circumstances of the heat generation?
 
Just minimal use. The back of the phone gets super hot and the bottom near the speaker/charging port area.

apparently this is a common issue across the new line up.
 
My 12 Pro gets warm/hot to the touch when it starts the searching for signal bug. It’s real hot on the back near the volume buttons.
 
The 12 Pro Max has a problem with heat. If you are using programs that require work in the background, you will feel the heat. If you using any kind of charger that uses wireless charging thru MagSafe (Apple or 3rd party), it will overheat if using a background intensive app.
 
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