| Ⅰ° |
Damage to the stratum corneum, lucidum, and granulosum of the epidermis. The basal layer is intact. |
Local vasodilation and congestion |
Local redness and swelling, also known as erythema burns. Pain and burning sensation, slightly increased skin temperature, no blisters |
After 3-5 days, the local area turns from red to light brown, the epidermis shrinks and peels off, and heals |
| Ⅱ° Blister Type |
Superficial Ⅱ° |
Reaches the superficial dermis |
Plasma-like fluid leaks from blood vessels, local edema, and exudate accumulate between the epidermis and dermis, forming blisters |
Severe pain, hypersensitivity, local redness and swelling, blisters of varying sizes containing yellow or light red plasma-like fluid or coagulated protein jelly. After removing the blister skin, the wound surface is red, with a network or granular dilated and congested capillary network |
Heals in about 2 weeks, no scars, with pigmentation |
| Deep Ⅱ° |
Involves the dermal papillary layer and below, but some reticular dermis remains, with skin appendages remaining |
Partial destruction of sensory nerves, local tissue necrosis |
Local swelling, dull pain, blisters may or may not be present, after removing the epidermis, the wound surface is slightly moist, slightly red or red and white, with a reticular thrombosed blood vessel, feels tough, lower temperature, painful hair plucking |
Heals in about 3-4 weeks, with obvious scars |
| Ⅲ° Eschar Type |
Involves the entire skin layer, sometimes deep into subcutaneous tissue, muscle, and bone |
Necrotic skin protein coagulates, forming eschar |
No pain sensation, no elasticity, dry, no blisters, leather-like, waxy white, charred yellow, or even carbonized, no pain on needle prick or hair plucking, visible large thrombosed tree-like blood vessel network |
Eschar dissolves in 3-4 weeks, granulation tissue forms, small wounds heal on their own, large wounds require skin grafting to heal |
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