Eleven days after anal fissure surgery is in the healing stage of the wound, redness is normal, but if there is a combination of pain and swelling, pus, etc., it may be due to infection. It usually takes 7~14 days for the surgical incision in the anal area to heal, and it may take longer if there is infection in some cases. Eleven days after anal fissure surgery, the surgical wound is still red, may be the color of normal granulation tissue, this situation is normal, it is recommended to pay attention to local cleanliness and hygiene, if necessary, you can use 1:5000 potassium permanganate solution sitz bath and other ways to carry on the local cleaning, reduce swelling, disinfection. However, if the redness of the wound is combined with pus, pain, swelling and other manifestations, or combined with systemic fever and other symptoms, we need to be vigilant about the possibility of wound infection, which requires the use of erythromycin ointment local application, taking penicillin, cefixime and other anti-infective drugs, and then disinfecting, debridement and other interventions if necessary. Redness, swelling and pain of the wound after anal fissure surgery, it is recommended to go to the hospital in time, to clarify the cause of the disease, and to give diagnosis and treatment. The above drugs need to be used under the guidance of clinicians.