A guy in my class’s BO genuinely makes me nauseous

There is a guy in half of my class periods that comes to school smelling so so so bad. It’s never the same exact smell either but I know it’s him because it’s like an aura that follows him in specific. Like today he smells like a dead animal it’s actually rancid. And I’ve been gone the last 2 days because im sick and it hit me like a bus as soon as he stepped into class and it like makes my stomach hurt. It doesn’t help that it’s humid af in this class. Like genuinely send help. Or soap idfk. I have to smell him for 3 more classes I don’t know if im going to make it. I swear he does it on purpose to amuse himself because I don’t know how you can’t smell yourself. Like it’s so bad. I want to tell him so bad because it’s actually sickening at times. Like it smells like rotting meat and blood not even normal BO smell it’s so foul. Like the type of smell that makes you wanna puke. I’m not the type to pick on people but holy shit bro.