The clinical manifestations of burns are related to their gradations, as follows: 1. first degree burns: burns only damage the superficial layer of the skin, local mild redness, no blisters, pain is obvious, 3-5 days can recover on their own, recovery can occur after flaking; 2. shallow second degree burns: common in burns caused by boiling water, hot soup, hot oil, generally manifested as blisters, epidermal peeling, pain is obvious, can rely on the remaining basal cells for healing, 3. deep second degree burns: pain is weaker than shallow second degree burns, but it belongs to the pain dull, the color of the wound is more whitish, recovery time is generally 1-7 days. The healing cycle is generally 1-7 days; 3, deep second-degree burns: pain is weaker than shallow second-degree burns, but it belongs to the pain is dull, the trauma color is more whitish, recovery time is longer, generally need 3-4 weeks, healing will leave scars; 4, third-degree burns: scalded skin is gray or reddish-brown, burns caused by subcutaneous fat, muscle, bone tissue are damaged.