The redness around the wound scab is usually caused by wound infection, allergy, proliferation of granulation tissue and other conditions. 1. Wound infection: If the patient’s wound is not cleaned properly, it is easy to cause the wound to become infected, redness, swelling, pain and other symptoms, resulting in the appearance of redness around the wound scab. 2. Allergy: If the patient’s wound comes into contact with allergic substances, such as animal fur, chemical substances, etc., it will lead to redness, swelling, itching and other allergic symptoms, resulting in a circle of redness around the wound scab. 3. Proliferating granulation tissue: proliferating granulation tissue will appear in the process of wound recovery, which may cause redness, itching and other symptoms, resulting in a circle of redness around the wound scab. It is recommended that patients go to the hospital in time for examination and diagnosis, to clarify the cause and timely treatment.