Nassau County EMT Practice Test

Full-thickness burns involve all layers of the skin (and often deeper tissues). The hallmark is a dry, hard, leathery area called eschar, with little to no sensation because the nerve endings have been destroyed. That combination—deep tissue destruction, dry leathery tissue, and insensate sensation—best describes a full-thickness burn. Describing it as deep, dry, leathery tissue with lost sensation captures why these burns require more than just topical care; they typically need surgical intervention such as grafting. In contrast, blisters with intact nerves indicate a less deep burn (partial-thickness), superficial reddening points to a superficial burn (first-degree), and a painless but not leathery area doesn’t convey the full depth and lack of sensation that define full-thickness injuries.