Most burns involve the upper limbs and or the head and neck region. Heat can cause partial or complete destruction of the skin and underlying issues. There may be great local and general effects. A large burn is a major illness and can be life threatening. The extent is expressed as a percentage of the total body surface area.
Depth is classified as partial or full thickness.
This is a better way than the older method of degrees. There is also so called DEEP partial, which has lost much of the dermis but there are epithelial pockets. With infection or inappropriate care it can become full thickness. FULL thickness - both epidermis and dermis are destroyed and will not regenerate the skin. RULE OF 9's - is a quick way of estimating, tbe surface area that is affected by a burn.