The redness of the stitches two months after knee replacement can be caused by many reasons, including physiological tissue repair, wound infection and so on. 1. Physiological tissue repair: two months after surgery, due to tissue repair, newborn granulation tissue appears at the wound, which can be manifested as redness at the suture site, usually without other uncomfortable symptoms, which is a normal phenomenon, no need to worry about it, usually with the passage of time, the redness will slowly disappear. 2. Wound infection: If the wound is infected in the second month after surgery, it can also be manifested as redness at the suture site, and accompanied by pain, swelling and other symptoms. Local or oral antibacterial drugs such as cephalosporins, cefuroxime, ceftriaxone sodium, etc. can be used. Redness of the stitches two months after knee replacement can also be seen for other reasons, and in general, the recovery of the knee joint after surgery is good. It is recommended to exclude physiological reasons, timely to the hospital to consult with the doctor, so as to avoid delays in the condition. The above drugs should be used under the guidance of a doctor, avoid self-medication.