My husband noticed a big blood blister on the inside of his cheek. About the size of the eraser on a pencil almost. First of all, can they get that big? The a few hours later, it bursted with little or no blood and now shows a little white spot of where this blister used to be. Is this considered a blood disorder? He doesn't remember biting it or anything, but, looking at his cheek, he has 1 or 2 other little red spots in the cheek that look almost like scratches. He did eat some deli bread that was thick with a thick tough=type crust on it. Not sure if that had anything to do with it. Not sure what exactlt that was. Anyone have a clue?