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.
There are various diseases that causes eruption of blisters on the skin tissues such as: 1  Erythema multiforme is what causes blisters on hands and palm, sole of feet, mouth, genitals and other parts of the body. The blisters may also be accompanied with other symptoms such as fever, muscle aches and sore throats.