AST Surgical Technologist Practice Exam 2025 – Complete All-in-One Guide for Exam Success

The classification of burns encompasses various degrees that correspond to the layers of skin and tissue affected. Third-degree burns are characterized by the destruction of the epidermis and dermis, and they extend into the subcutaneous tissue. This degree of burn results in a significant loss of skin structure and function, often appearing white or charred. The painful sensation is often reduced in these areas due to nerve endings being destroyed.

In contrast, first-degree burns involve only the epidermis and result in redness and pain but do not penetrate deeper layers of skin. Second-degree burns extend into the dermis, causing blisters and severe pain but not reaching the subcutaneous tissue. Fourth-degree burns surpass third-degree damage, affecting not only the skin layers but also underlying muscles, tendons, and bones. Hence, the correct answer regarding the classification that impacts the epidermis and subcutaneous tissue is third-degree.