What finding confirms second degree burns in victims of a thermal blast?

The presence of moist blebs and mottled skin is characteristic of second-degree burns, which are also known as partial-thickness burns. These burns affect both the epidermis and part of the dermis.

Moist blebs, or blisters filled with clear fluid, form as a response to the damage caused by heat. The skin may appear mottled due to variations in blood flow and inflammation, which can result from the injury. The fluid in these blisters is a natural part of the healing process and helps protect the underlying tissue while it heals.

Other options describe different conditions. Dry, flaky skin is more indicative of first-degree burns or generalized skin conditions, while charred skin suggests third-degree burns, where the skin is completely destroyed and appears blackened or leathery. A single blister could indicate a less severe burn as it may not encompass the characteristics seen in more extensive second-degree burns.