Burns Degrees

Gravity
The severity depends on the penetration, the size and location. They are classified into four grades.
* First grade: you just have erythema (redness) and inflammation of the affected area
* Second degree: injury is only in the epidermis (outer layer of skin), and present with blisters
* Third grade: We present destruction of the epidermis with necrosis that often require skin grafts
* Fourth grade are those that penetrate deeper areas of muscle, bone or other organs
Extension
The extension value indicates the percentage of injured body surface (eg, each leg is 18%, each of the 9% upper limbs, head, 9%, anterior or posterior chest 18% each, genitalia 1% ).