I'm a firm believer in listening to ones intuition about these things. If something doesn't feel right, then there is usually something not right. Can't let fear mix up with intuition of course, which can happen. But if an individual can separate the two well, a great deal of sensing the world is unlocked.
So the person can't even smell it most of the time... That is very interesting. Fortunately the smell isn't so strong; for example, it doesn't linger after they walk around. and I can only smell if I get up close. It's no wonder they probably don't realize it. Doesn't even smell it themselves if it's so weak. But I think it's building up and can become like what the posters here talked about: smelling up the room.
The next time I see them, I am going to tell them what's up. It's very concerning.