What is true of fourth-degree burns?

Fourth-degree burns are indeed severe injuries that extend beyond the skin into deeper tissues, including muscles, tendons, and bones. Because of the depth and severity of the tissue damage, these burns can lead to significant complications, including infections, and often require surgical intervention, such as skin grafts or even amputation. Due to the extensive nature of the damage, medical treatment is essential for healing and to prevent life-threatening situations.

In contrast, the other options do not accurately characterize fourth-degree burns. They are the most severe type of burns, affecting multiple layers of tissue, rather than being the least severe. Fourth-degree burns involve more than just the outer layer of skin; they can damage structures far deeper within the body. Healing is not feasible without intervention; hence they do not heal on their own. Recognizing the critical nature of fourth-degree burns is important for ensuring appropriate and timely medical care.