Oh, I agree that many people are far too paranoid about lithium-ion cells. But, I wouldn’t keep a cell that stays hot when it’s not being used. That is trouble.
Stick it in a metal can and let it cool down. Line the can with some plastic so it doesn’t short. When it reads close to 0 volts, throw it out or recycle it. I assume it’s an internal short, so it should discharge by itself over a few hours or days.