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.
Friction occurs when something rubs against your skin for a prolonged period of time. This happens most commonly on hands and feet. Contact dermatitis can also cause blisters. This is a skin reaction to allergens, like poison ivy, latex, adhesives, or irritants like chemicals or pesticides.