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.
Some of the common causes of having blisters on hands can include: Dyshidrosis. This is a type of eczema, which is a skin condition, will frequently cause multiple blisters on hands that can cause pain and itch at the same time. When these blisters break open they can be prone to developing an infection.