Definition

Burns are injuries to tissues caused by heat, friction, electricity, radiation, or chemicals. Scalds are a type of burn caused by a hot liquid or steam.

Description

Burns are classified according to how seriously tissue has been damaged. The following system is used:

• A first degree burn causes redness and swelling in the outermost layers of the skin.
• A second degree burn involves redness, swelling, and blistering. The damage may extend to deeper layers of the skin.
• A third degree burn destroys the entire depth of the skin. It can also damage fat, muscle, organs, or bone beneath the skin. Significant scarring is common, and death can occur in the most severe cases.

The severity of a burn is also judged by how much area it covers. Health workers express this factor in a unit known as body surface area (BSA). For example...