Crusting is the coagulation of a mixture of plasma, blood and exfoliated tissue from a skin injury after it has dried up, and the scabs formed by crusting provide some protection to the trauma. In order to avoid scar formation or wound infection as much as possible, the scab should be allowed to fall off naturally after the skin has completely healed. If the scab is accidentally picked off, different measures should be taken depending on the recovery of the wound: i. The wound is completely healed: If the skin surface is clean and dry, there is usually no need to treat it or apply emollient cream or epidermal growth factor gel to facilitate the repair of the epidermis. Second, the trauma is not completely healed: 1, no exudate: use cotton swabs dipped in saline to clean the trauma from the inside out, or use saline to rinse the trauma directly, and then expose the trauma after cleaning; 2, there is exudate: apply iodophor to disinfect from the inside out, and use sterile gauze to bandage the trauma briefly, and use mupirocin ointment or fusidic acid cream to prevent infection. If there is bleeding after the scabs fall off, sterile gauze can be used to stop the bleeding before proceeding with the above treatment. In addition, it is important to pay attention to the symptoms of redness and swelling of the wound surface with generalized fever. If the wound is small and exudates little, do not bandage it as much as possible. After treatment, keep the wound clean and dry to avoid the growth of bacteria.