Which of the following is a symptom of a first-degree burn?

A first-degree burn is characterized by damage to the outer layer of the skin, known as the epidermis. The primary symptoms of this type of burn include redness, swelling, and pain, which are indicative of inflammation and irritation in response to the injury. The redness occurs because of increased blood flow to the area, while swelling can result from fluid accumulation. Therefore, the presence of redness and swelling is a direct reflection of the tissue response to the burn, making it a clear symptom of a first-degree burn.

In contrast, blisters are associated with second-degree burns, which involve damage to both the epidermis and the underlying layer, making blisters a sign of a more severe injury. White or charred skin indicates third-degree burns, where the injury extends through all layers of the skin, resulting in damage to deeper tissues. Lastly, while pain is a characteristic of first-degree burns, it is generally accompanied by discomfort and sensitivity. The choice that best fits the description of a first-degree burn is the presence of redness and swelling.