Bottom of iPhone 11 is getting hot

Hello community of apple.. I’ve got a question... is it normal that the bottom of my iPhone 11 is getting hot? It only gets hot on the display and i have 86% battery ... I’m really scared that I need to get a new iPhone or replace the battery.. but i heard in the bottom of iPhone is Taptic engine ... so maybe that could be the problem ... the iPhone is only 1 year old and it started getting hot when i was calling my friend ... please respond to me if you know if it’s normal... also my iPhone is not lagging.. and it’s always getting hot when i use it