Twenty days after the incision and drainage of perianal abscess, a little red around the wound is mostly due to wound inflammatory reaction or wound infection caused by the need to consult a doctor in time to identify the cause of the disease. 1. Inflammatory reaction of the wound: after incision and drainage of perianal abscess, due to tissue necrosis, inflammatory factors, resulting in wound infiltration by inflammatory cells, inflammation is the basic pathological process is the body’s defense reaction, inflammation will appear local vasodilatation, wound congestion, resulting in red spots around the wound. 2. Wound infection: due to the perianal abscess incision and drainage surgery after the care is not standardized, resulting in open wound infection, a little red around the wound, while the abscess fluid can not be discharged in a timely manner, accompanied by inflammatory reaction. After perianal drainage, you need to take standardized care of the wound, disinfect and change the medicine, and regularly review the wound under the guidance of a professional doctor. If the symptoms worsen need to consult a doctor in time to identify the cause of the disease, give appropriate treatment, can not delay treatment.