What type of burn affects only the epidermis?

A first-degree burn affects only the epidermis, which is the outermost layer of the skin. This type of burn is characterized by redness, minor swelling, and pain. It does not lead to blistering or damage to deeper layers of the skin, such as the dermis or subcutaneous tissue.

The epidermis serves as a protective barrier, and first-degree burns usually heal within a few days without scarring, as they do not penetrate beyond this topmost layer. Examples of first-degree burns include mild sunburn and brief contact with hot surfaces or liquids. The overall recovery process is typically quick, illustrating the resilience of the epidermis.

In contrast, second-degree burns involve damage to both the epidermis and part of the dermis, which can result in blisters and more significant pain. Third-degree burns extend through the epidermis, dermis, and even deeper tissues, often leading to a loss of sensation in the affected areas due to nerve damage. Fourth-degree burns are the most severe, affecting all layers of the skin and underlying tissues, including muscle and bone. Thus, the defining characteristic of a first-degree burn is its restriction to the epidermis, making it the correct choice.