Possible causes of redness in the wound healing scar after perianal abscess surgery include scarring, anal fistula, and localized infection. Choose the treatment according to the specific situation. 1. Keloid hyperplasia: If the patient is keloid, it will lead to keloid hyperplasia at the incision site after surgery, and a red bump will appear. Treatment, if there is no symptom, no special treatment, if it affects defecation or hardening of the scar, feasible release surgery. 2. anal fistula: perianal abscess patients postoperative care is not in place may lead to recurrence of the disease and the further formation of anal fistula, there will be postoperative incision around the healing scar red. Fistula resection or fistulotomy can be taken to treat. 3. Infection: postoperative local care is not in place, resulting in inflammation of the healing scar tissue, there will be redness or accompanied by swelling, pain and so on. You should actively do the postoperative incision cleaning care, if serious, the systemic inflammatory reaction, fever, etc., can be given penicillin, cefixime and other antibiotic treatment. If the above symptoms occur, patients are recommended to standardize the treatment under the guidance of professional doctors.