Ans: A first-degree burn is an epidermal injury in which skin functions and barrier protections are maintained. It is characterized by redness, pain, and tenderness to touch. In large first-degree burns, localized edema, chills, headache and nausea or vomiting may occur. Blisters do not occur immediately, although they may be present after 24 hours. The skin will usually peel in 24 to 48 hours and heal within 5 days. Sunburn is an example of a first-degree burn...A second-degree or partial-thickness burn is an epidermal and dermal injury in which skin functions and barrier protections are absent but skin appendages are maintained. Second-degree burns can be either superficial or deep depending on the depth of dermal injury. They are very painful. An example of a second-degree burn is a thermal burn from a hot liquid. Superficial second-degree burns are characterized by the immediate development of fluid-filled blisters. The skin is red to pale ivory and moist because of the lost of vapor barrier. The injury heals in 21 to 28 days with the possibility of scarring depending on genetic predisposition and the amount of time the injury takes to heal...A third-degree or full-thinkness burn is an injury that affects all layers of skin including epidermis, dermis, and subcutaneous tissue. It may even involve bone and underlying tissues. All skin appendages, skin functions, and barrier protections are lost. Blisters are rare. There is no associated pain. The skin color is cherry red, white, or black. It looks dry, think, and papery or dry and leathery. It will heal only with skin grafting. Scarring usually occurs.