Classification of burns is crucial in understanding their severity, which is determined by their depth and extent. Burns primarily affect the skin's two main layers: the outer epidermis and the deeper dermis.
Superficial burns, also known as first-degree burns, involve only the epidermis. These burns are characterized by warmth, pain, redness, softness, and blanching upon touch. A classic example is a sunburn.
Partial-thickness burns, categorized as second-degree burns, extend into the dermis. These burns can vary in depth within the dermis and are typically very painful, red, blistered, moist, soft, and blanch upon touch. They commonly result from contact with hot surfaces, liquids, or flames.
Full-thickness burns, known as third-degree burns, penetrate through both the epidermis and dermis into the subcutaneous fat or deeper tissues. These burns often lack pain sensation, appear white, brown, or charred, and feel firm and leathery to palpation with no blanching. They are commonly caused by exposure to flames, hot liquids, or superheated gases.
It's essential to classify burns as minor or major based on their size and depth. Minor burns typically encompass less than 10% of the total body surface area (TBSA), mainly consisting of superficial burns. Major burns, on the other hand, lack a precise definition for size but are generally considered significant if they exceed certain thresholds, such as more than 20% TBSA in adults and more than 10% TBSA at the extremes of age, in children and the elderly.
While superficial and superficial partial-thickness burns often heal without surgical intervention, more severe burns necessitate careful management, including the use of topical antimicrobial dressings and, in some cases, surgical procedures. Additionally, burns involving deeper tissues, such as muscle or bone (classified as fourth-degree burns), often require specialized attention and may result in the loss of the affected limb or area.
| Feature | Superficial (first-degree) | Partial-thickness (second-degree) | Full-thickness (third-degree) |
|---|---|---|---|
| Tissue involved | Epidermis only | Extends into the dermis, at varying depths | Through epidermis and dermis into subcutaneous fat or deeper |
| Pain | Painful | Typically very painful | Often lacks pain sensation |
| Appearance | Red, warm | Red, blistered, moist | White, brown, or charred |
| Palpation | Soft | Soft | Firm and leathery |
| Blanching | Blanches on touch | Blanches on touch | No blanching |
| Typical cause | Sunburn is the classic example | Contact with hot surfaces, liquids, or flames | Flames, hot liquids, or superheated gases |
| Healing | Often heals without surgical intervention | Superficial partial-thickness burns often heal without surgery | Needs topical antimicrobial dressings and, in some cases, surgery |
