What defines a second-degree burn?

A second-degree burn is characterized by partial thickness skin damage, which involves both the epidermis and part of the dermis. The presence of blisters is a hallmark feature of this type of burn, as they form due to fluid accumulation between the layers of damaged skin. This blistering indicates the skin is still capable of some regeneration and healing, but significant damage has occurred.

In contrast, other types of burns do not share these characteristics. For example, first-degree burns affect only the epidermis, presenting as red and dry without blisters. Conversely, third-degree burns are full thickness and may present with charring or a dry, leathery appearance, with a loss of sensation in the burned area due to nerve damage. Thus, the distinct features of second-degree burns—specifically the partial thickness and the presence of blisters—accurately define this category of burn injury.