Final answer:
A first-degree burn is also known as a superficial burn, which affects only the epidermis and typically heals within a few days.
Step-by-step explanation:
A first-degree burn is also known as a superficial burn. This type of burn affects only the epidermis, which is the outermost layer of the skin. First-degree burns are usually characterized by pain and redness, and they often swell, but they do not blister. These burns, such as mild sunburn, tend to heal on their own within a few days. In contrast to first-degree burns, second-degree burns are referred to as partial-thickness burns and third-degree burns are known as full-thickness burns. Both of these more severe burns penetrate deeper into the skin and require more medical attention.