Hi, I am an 89 yeaer od female. On Warfarin 5mg per day. My leg bumped my ktchen table leg Tiesday morning and a large blood blister appeared at once. I went to my family Dr that day and he said to leave it alone. My concern is that it could open on its own and wherever I am there will be a lot of blood all over - my carpeted home, the home of someone I am visiting, while I m driving my car, whatever. Is that possible and what should I do about it? Don t know why my Dr didn t take care of it in his office. Is It worth a trip to an ER?