Burns are classified by depth. First-degree burns are superficial and cause local inflammation of the skin. Sunburns are often classified as first-degree burns. Inflammation is characterized by pain, redness and slight swelling. Skin can feel very sensitive. Second-degree burns are deeper and cause blisters on the skin in addition to pain, redness, and inflammation. Third-degree burns are even deeper, affecting all layers of the skin, effectively killing the skin in the area. Because nerves and blood vessels are damaged, third-degree burns appear white and leathery and are usually relatively painless. Burns are not static and can mature. Within hours, first-degree burns can affect deeper structures and progress to second-degree burns. Think sunburn with blisters the next day. Similarly, second-degree burns can progress to third-degree burns. Regardless of the type of burn, there is inflammation and fluid buildup in and around the wound. In addition, the skin is the body's first defense against infections caused by microorganisms. A burn is also a skin injury, and the risk of infection is not only at the injured site, but also in some cases throughout the body. Deeper burns can leave permanent injuries and scars that prevent the affected skin from returning to normal function. Treatment of burns depends on the depth, extent and location of the burn. Burn depth is commonly classified as first, second, or third degree. First-degree burns are superficial burns and have characteristics similar to typical sunburn. The skin is red and the feel is the same. In fact, it usually hurts a little. Second-degree burns are similar to first-degree burns. However, the damage is now severe enough to blister the skin, and the pain is usually a little more intense. The skin is white and numb. In addition to burn depth, the total surface area of ​​the burn is important. Burns are measured as a percentage of the total body affected. Only 2nd and 3rd degree burns are summed to measure the total burn area of ​​the body. First-degree burns are painful but leave the skin intact and play a role in maintaining fluids and temperature. When more than 15-20% of the body is burned, significant water loss occurs. There is a possibility. If not enough fluids are given intravenously, shock can occur. As the rate of burns increases, so does the risk of death. Patients with burns of less than 20% of the body should recover, but those with burns of 50% or more are at significant risk of death, depending on various factors such as underlying disease and age. In full-circumthoracic burns, as the burn progresses, the affected tissue may not move the chest wall enough to allow adequate breathing. When surrounding burns occur on the arms, legs, fingers, or toes, the same strictures can impede blood flow and threaten the limb's survival. Burns on wrinkled areas of the body, such as the palms, backs of the knees, face, and groin, may require special treatment. As the burn progresses, the skin becomes scarred and shortens, completely impairing the body's range of motion.