Damage to the skin and tissues of the body caused by heat, chemicals, electricity, etc. is called a burn. Clinically, burns are classified into 3 degrees. Since only minor burns can be treated at home, only minor burns (1st degree burns) are introduced in this article. Chemical burns can be caused by a variety of irritating and toxic chemicals, including strong acids, strong bases, phenol, toluene (organic solvents), mustard gas, phosphorus, etc. Chemical burns can cause tissue necrosis and slowly expand a few hours after the burn. Electrical burns, caused by the flow of electric current through the body to produce high temperatures above 5,000 degrees Celsius, where a large amount of electrical energy is converted into heat to make the surface burn. The depth of the burn can be divided into I degree, shallow II degree, deep II degree and III degree. I degree burns have red, non-blistered skin, dry surface, and after 2-3 days, the burned skin flakes off and heals without scarring in 3-5 days. Skin damage from seaside sunbathing is a first-degree burn. Shallow second-degree burns are the most common type of burns, with severe pain on the traumatic surface, significant tissue redness and blister formation, and generally healing in about 2 weeks. Deep second-degree burns with epidermal avulsion, basal red and white, and dull pain, if the wound is not deepened by infection, take about 3 weeks to heal, but leave a scar. third-degree burns with pale skin or scab formation and loss of pain require surgical implants.