A hair tourniquet is the term for a piece of hair or a thread from clothes or a blanket that wraps around a child's finger or toe. It may also happen on other parts of the body, like a wrist, an ankle, or the penis. The hair may wrap so tightly that it blocks blood flowing into the area. This can damage the tissue.
Sometimes the hair is easy to see. But sometimes it's so deep in the folds of the skin that it's hard to see.
Your doctor may remove the hair or thread in an emergency room or clinic. If the hair is deep, it may have to be removed by a surgeon in an operating room.