Area can only be said to be a range of areas.
The grading depends on its clinical manifestations, as follows:
First-degree burns-skin redness, pain and burning sensation, can be improved and healed in 3 ~ 5 days, and desquamation does not leave scars.
Second-degree burns-deep into the dermis, local blisters, so it can be called blister burns. It can also be divided into shallow three degrees, which only hurts the superficial dermis and some mucus layers are healthy. Due to more exudation and full blisters, the wound surface exudes obviously after rupture; The bottom of the wound is red and swollen; Have severe pain and allergies; The skin temperature rises, and if there are no complications such as infection, it can be cured in about 2 weeks. After healing, there is no scar, pigmentation can appear in a short time, and the skin function is good. Deep second degree injury of dermis, skin attachment still remains. Because the metamorphic surface tissue is slightly thicker, the blisters are smaller or thinner, the feeling is slightly dull, and the skin temperature can be slightly lower. After exfoliation, the wound surface is reddish or red and white, or reticular embolic blood vessels can be seen; There is little exudation on the surface, but the bottom is obviously swollen. If there are no complications such as infection, it can be cured in 3 ~ 4 weeks. Because there are some granulation tissues and scars in the middle of the repair process, the skin function is basically preserved. In addition to redness, pain and burning sensation, blisters will appear on the skin.
Third-degree burns-can hurt the whole skin, even deep to the subcutaneous, muscle and bone. Skin necrosis and dehydration can form eschar, and the wound surface has no blisters, waxy white or brown, feels like leather, and even carbonizes. The feeling disappeared; The skin temperature is low. Natural healing is very slow, and it is necessary to support the eschar to fall off. After granulation tissue grows, it forms scars, with only epithelium at the edge, which not only loses skin function, but also often causes deformity. Some wounds are even difficult to heal themselves.