Which degree of burn is most severe?

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Burn depth and tissue involvement determine how severe a burn is. A third-degree burn is full-thickness damage that crosses the entire epidermis and dermis and may extend into deeper tissues such as fat or muscle. Because the nerve endings can be destroyed in these injuries, the area may feel numb rather than painful, even though the harm is extensive. The appearance can be white, brown, red, or charred and the skin tends to be leathery. These burns heal slowly, carry a high risk of infection and significant scarring, and typically require medical treatment and sometimes grafting.

First-degree burns affect only the outer skin layer and are typically red, painful, and heal quickly without surgical treatment. Second-degree burns injure the epidermis and part of the dermis, often with blisters and significant pain but not full-thickness. Fourth-degree burns imply damage that goes beyond the skin into deeper tissues like muscle or bone—more extensive than the standard skin burn grades. Among these options, the deepest standard skin-layer burn described is third-degree, making it the most severe choice in this context.