Also known as erythema burn, it only hurts a part of the epidermis, but the mucous layer is alive, so his ability of proliferation and regeneration is active, and he often heals within 3 ~ 5 days without leaving scars.

2. Shallow second-degree burns

The whole epidermis and part of the papillary layer were injured. Because the mucous layer is partially damaged, epithelial regeneration depends on the epithelial proliferation of residual mucous layer and skin accessories, such as sweat glands and hair follicles. If there is no secondary infection, it usually heals after 1 ~ 2 weeks without leaving scars.

3. Deep second-degree burns

The burn depth is below the dermal papillary layer, but some dermal and skin attachments still exist. Healing depends on the proliferation of epidermal progenitor cells in the epidermis of skin appendages, especially the protruding parts of hair follicles.

Fourth and third degree burns

Also known as eschar burn. Generally speaking, in the whole process of skin burn, epidermis, dermis and skin appendages are all destroyed, and wound repair depends on surgical skin grafting or skin flap repair.

5, ⅳ degree burns

Burns go deep into muscles, bones and even internal organs. Wound repair depends on surgical skin grafting or skin flap repair, and severe cases require amputation.

6, shallow burns

The wound healed spontaneously within 2 1 day after injury, including first degree burn, shallow second degree burn and partial shallow second degree burn.

7. Deep burns

It takes more than 2 1 day for the wound to heal itself. Including deep second-degree burns, third-degree burns and fourth-degree burns with infection, usually require surgical treatment.

8. Moderate burns

The burn area of adults is between 1 1% ~ 30% (children are 5% ~ 15%) or the third-degree burn area is below 10% (children are below 5%), and there is no inhalation injury or serious burn complications.

9. Severe burns

The burned area of adults is between 365,438+0% and 50% (children are between 65,438+06% and 25%) or between 65,438+00% and 20% (children are below 65,438+00%), or the burned area of adults is less than 365,438+.

Extended data:

Burn first aid

Principle of first aid for burns ~ Get away from the source of injury quickly, cold therapy immediately, give first aid nearby, and transport.

1, thermal burn

Include flame, steam, high temperature liquid, metal, etc.

2. For chemical burns

The severity of burn is related to the nature, concentration and contact time of acid and alkali. Therefore, no matter what kind of acid and alkali burns, they should be washed immediately with plenty of water for at least 30 minutes. On the one hand, it can dilute and remove the residual acid and alkali, on the other hand, as a way of cold therapy, it can relieve pain. Pay attention to the amount of boiling water to be large enough to quickly wash away the residual alkali from the wound. For head and face burns, we should first pay attention to whether the eyes, especially the cornea, are burned, and give priority to irrigation.

3. Electric burns

When giving first aid, you should immediately cut off the power supply. Do not touch the patient without cutting off the power supply to avoid electric shock and injury. At the same time, you should be treated with artificial respiration and external cardiac compression, and transferred to the nearest hospital for further treatment in time.

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