A defensive maneuver in which one or more linebackers or defensive backs, who normally remain behind the line of scrimmage, instead charge into the opponent's backfield. However, in the 3-4 defense, one linebacker typically rushes the passer with the three down linemen.
Blisters are commonly caused by friction from tight shoes, herpes, chicken pox, poison ivy and allergic reactions. More uncommon are disorders that only cause blisters on the hands and feet. See your doctor for an accurate diagnosis if you have blisters on your hands and feet, particularly from an unknown cause.
Blood blisters can be caused due to constant rubbing of the skin which is often caused for baseball pitchers. It can occur when sharp tool tears the skin. Frostbite can also cause blisters on the skin. Symptoms : Blood blisters are seen mostly on the hands or feet when the skin is injured or cracked. It is the collection of serum fluid in the damaged area of the skin. It may or may not cause pain. In case of infection, blood blisters turn red in color with moderate swelling.