I think the above posts have said it all - if your doc told you to abstain from alcohol he would mean abstain from drinking it. He would not object to a surgeon rubbing it over an operative site, of your dentist giving you a mouthwash with alcohol in. It is the manner of which you utilize it he warns you against.
Similarly eating blood is not the same as an injection/transfusion of blood. Unlike alcohol blood is not a food. A starving man would not benefit from a blood transfusion. But anything taken orally, including alcohol , would likely save him.