The first-degree injury and scald only damage the surface layer of the skin, with slight redness, no blisters and obvious pain. Take off your clothes and socks immediately, soak the wound in cold water for half an hour, and then wipe the wound with sesame oil and vegetable oil. Second-degree injuries and scalds are dermal injuries, local swelling and pain, and blisters of different sizes. For larger blisters, the edge of the blister can be broken with disinfectant needle to release water, and then wrapped with hot paste with moderate tightness. Third-degree injury, scald under the skin, fat, muscle and bone damage, gray or reddish brown. At this time, the wound should be bandaged with a clean cloth and sent to the hospital in time. Never apply purple liquid medicine or ointment to the wound, which will affect the observation and treatment of the disease. Patients with severe injuries and burns may go into shock or stop breathing and heartbeat during transfer, so artificial respiration or chest massage should be performed immediately. When the wounded are thirsty, they can drink a small amount of hot tea or light salt water. Never drink a lot of boiled water in a short time, which will lead to brain edema of the wounded.