2. Dark gray or black necrotic spots appear on the wound: necrotic spots often appear on wounds infected by Gram-negative bacilli.
3. Wound deepening or delayed healing: Ischemic necrosis is caused by bacteria invading deep blood vessels, and wound healing is delayed due to wound deepening.
4. The eschar deliquesces and falls off in advance, or the insect bite changes, indicating local infection.
5. There is redness, bleeding or necrosis around the wound, and there is obvious inflammatory reaction at the edge of the wound infected by hemolytic streptococcus.
6. There is pus or abscess under the scab: After Staphylococcus aureus infection, abscess can appear under the scab. If there is sweet green pus under the scab, it is mostly Pseudomonas aeruginosa infection. (Suzhou Burn Department, Suzhou Burn Department Expert)
7. Edema, redness or necrosis of granulation tissue: Staphylococcus aureus or fungal infection can lead to granulation tissue necrosis, while green bacteria can reproduce necrotic spots on granulation wounds. (Suzhou Burn Department, Suzhou Burn Department Expert)
8. Gray spots on scab skin or eschar wound surface often indicate fungal infection, and the spots quickly develop to the wound surface and fuse into flaky villi, and the surface color gradually becomes obvious, showing gray, light green, light yellow or brown, and a thin layer of powder appears on the wound surface several days later.
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