Is it a foul to hit someone in the face while playing football?

That depends. If you hit your arm normally when passing the ball, and it is not too heavy, it is generally not a foul. If you deliberately raise your arm, or if you can't pass your opponent, use your arm to limit your opponent in order to achieve the purpose of passing, it is a foul; Besides, you didn't actually foul, but the other side tried to invade you, but was injured by your arm. It depends on the injury. Different referees have different conclusions. Some referees don't stop the game when they think the attack is beneficial, and some referees stop the game when someone is injured or bleeding. Referees in football matches are like terminators. You have to see where his bottom line is, so football is humanized. Why doesn't FIFA want some high-tech means to get involved in football? It is here that it hopes that football will be decided by people, so that there will be more variables and disputes and it will be more exciting!