What is a main feature of first-degree burns?

First-degree burns are characterized by their limited depth of injury, affecting only the epidermis, which is the outermost layer of the skin. This type of burn typically presents with redness, minor swelling, and pain, but it does not damage the deeper layers of skin. The skin maintains its moisture and vital functions, and there is no blistering or charring.

In summary, the defining feature of a first-degree burn is that it involves only the epidermis, leading to symptoms such as redness and tenderness but with a quick healing time, usually within a few days. This contrasts with deeper burns, where damage extends into the dermis or beyond, resulting in different clinical manifestations and healing timelines.