There is a condition known as "cobblestone roof" or "cobblestone mouth" that I have read of, (and actually had once, which the dentist was pointing out to his assistant quite excitedly) that is supposedly a manifestation of Crohn's Disease as found in the lower gut, but happening in the mouth. (All part of the gastrointestinal tract, as every textbook on Crohn's will point out.) I do not know how this normally behaves, I merely know it exists and is supposedly diagnostic of CD. It is a quite rare symptom, so many doctors may not ever have heard of it if they are struggling to know much about
Crohn's. It's the sort of thing that gets mentioned on "House" !
If you get bleeds from inflammation lower in the gut, I would guess - and that's all it is, it's not my experience - that you can get similar bleeding from the blisters in the mouth. Certainly, apthous ulcers don't have a reputation for bleeding that I can remember - painful, yes, but not leaking blood. (Zinc oxide on those will make them vanish - I have heard that they are a symptom of zinc deficiency, I don't know how true it is.)
For what it is worth puppylover, just last night I was researching food substances with an affect against MAP (the bacteria that is often pointed to as the main suspect in causing Crohn's) and there on the list was simple cinnamon. The research paper which mentioned it was pretty technical and made no claims, but as it is so cheap and ties in well with my low-sugar diet, I for one am going to try it. (Be aware of course, that just because it is a natural substance, it may not neccesarily lack side-effects for someone who is particularly sensitised.) I believe turmeric is another one which is well known for anti-IBD effects.