What characterizes a partial-thickness or second-degree burn?

A partial-thickness or second-degree burn is characterized by the presence of reddened skin along with blisters. This type of burn affects both the epidermis (the outer layer of skin) and part of the dermis (the second layer of skin), resulting in characteristics such as swelling, pain, and the formation of blisters. The damage to the skin layers is more significant than in first-degree burns, which typically only involve redness and minor pain without blistering.

In the context of the options provided, the presence of blisters is a key distinguishing factor of second-degree burns, making this the right choice. The blisters provide a protective barrier, but they are also a clear sign of skin injury that goes beyond surface damage and indicates involvement of deeper layers of skin. Understanding the specific symptoms associated with burns is crucial for proper assessment and treatment in tactical and medical scenarios.