There are many facial veins around the mouth. These veins all connect to other important facial arteries, and relate to the cavernous sinus (net structure of capillary vessels). However, facial arteries are lack of valvula venosa (something can prevent the blood to float back), once these places was affected, it will spread to the whole face even into the encephalic, it will threaten the life!
In the modern world, men seldom grow a long beard, it would be cut by shavers or razors if it grows to a certain length. But a few men prefer pulling it out to cuting it. In fact, pulling out the beard is very danger, you could be killed by this hobby.
Pulling out the beard would probably lead to such a situation, because it is very easy to damage the facial skin, facial hair follicles and sebaceous glands. Once such damage happens, germs and virus which adhere to the face will enter and do harm to the skin tissue. The dangerous can be inflammation of the skin or furuncle, even spread to the whole face or inside the head, it's very danger to men's healthy.