Construction Health and Safety Technician (CHST) 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer is characterized by the complete destruction of both the epidermis and dermis layers of the skin. In addition to this extensive damage, it also involves injury to the underlying tissue, which may include fat, muscle, and even bone. This type of burn often appears white, charred, or leathery and typically does not cause pain in the burned area itself due to nerve damage.

This level of injury often requires advanced medical treatment and may necessitate surgical interventions such as skin grafting, highlighting its severity. Other types of burns affect only specific layers of skin and do not penetrate as deeply. First-degree burns impact only the outermost layer (epidermis), while second-degree burns involve the epidermis and part of the dermis. Fourth-degree burns go beyond the skin, affecting deeper tissues, but it is essential to recognize that third-degree burns represent the complete destruction of skin layers.