I have plenty of doubts about what I'm going to ask you, but I'm bored right now, and don't completely understand it in my case, so I'll ask anyway :p
Find an area on your body that has some dry skin.. Probably your arm may be the most effective.. And give it a good scratch... Scratch it until it's very dry and maybe bleeding a little. Now smell it. Does it have a scent?
I used to wash dishes at my job, and my arms would always have a rash all over them that persisted because of it.. While I tried not to, sometimes I would just get irritated and scratch away.. And when I would it would have this really odd smell. It was almost like some kind of plant oil smell. This rash wasn't poison ivy or anything like that, though..
My arms have cleared up after getting off dish, but I swear I can still smell it I'm ever scratching away.
Hehe, I realize this sounds stupid, and there's no point in scratching up your arm if you don't have to.. Maybe remember this next time you you have a rash or some very dry skin.
I suppose what I'm suggesting is that what you're smelling is in your body's oils or blood, which of course goes all through you. Maybe this scent of blood (assuming it's related to chronic BB) is a sign that the source of our BB goes well beyond the oral cavity.
Nothing to deeply consider, mind you, just a thought I wanted to share.
Take it however you like
