What is a distinguishing feature of a second-degree burn?

A second-degree burn is characterized primarily by the presence of blisters. This type of burn affects both the outer layer of skin (epidermis) and the underlying layer (dermis), which leads to significant damage and a more pronounced response from the body. Blisters form as a protective mechanism, allowing the damaged skin to heal while also safeguarding the underlying tissues from infection and further injury.

The development of blisters distinguishes this type of burn from first-degree burns, which only cause redness and minor discomfort, and third-degree burns, which can result in charred tissue and severe damage extending through all skin layers. Understanding that blisters are a hallmark of second-degree burns helps to assess the severity of a burn injury and informs appropriate first aid responses and medical treatment.