We have covered several kinds of disruptions in the class, but probably the most difficult to address is a report from participants that one of them has bad odor or bad breath. It cannot go unaddressed, just as a flickering light in the room has to be fixed, and it must be done privately.
Privately:
“Bob, this is not easy to share, and it feels very uncomfortable to do so, but it appears that you have body odor and it is a bit of a distraction. Is it a medical condition or something preventing you from freshening up more often?”
If he tells you that it is a medical condition, there isn’t anything more that you can do. You cannot pry by asking what is wrong with him. You can only thank him for his time and leave it as that.
Solution:
“Is there any way you can freshen up before the class or during a break?”
By phrasing it as action he has to take, you are letting him know that it is your responsibility.
The important thing to remember is to be as kind and sensitive as you can, ask if there is anything you can do, and then ask him to take some form of action to remedy the situation.