A burn injury can be described by various synonyms, depending on the severity and type of burn sustained. A first-degree burn, which only affects the outermost layer of skin, can be referred to as a thermal or sunburn. A second-degree burn, which affects the epidermis and can cause blistering, can be described as a partial-thickness burn or scald. A third-degree burn, which penetrates through all layers of skin and can cause permanent scarring, can be called a full-thickness burn. Other terms used to describe burn injuries include chemical burn, electrical burn, radiation burn, and friction burn. These synonyms help medical professionals accurately diagnose and treat burn injuries.