Pain in old wounds may be caused by local inflammation. Inflammation is divided into aseptic inflammation and bacterial inflammation, aseptic inflammation is the wound at the time due to deeper injury, resulting in damage to the soft tissues inside, even fascia, muscle, late injury recovery is not good resulting in local chronic aseptic inflammation. You can apply an ointment to relieve swelling and pain, activate blood circulation and remove blood stasis, and take oral non-steroidal anti-inflammatory drugs, the symptoms can be slowly relieved. If it is caused by bacterial inflammation, attention must be paid to whether there is a foreign body stored inside the wound resulting in a foreign body reaction, with surface skin flushing, swelling, increased skin temperature, redness, swelling, and heat pain. If it is a metal foreign body, mud, sand or Plexiglas, it can be seen on a local X-ray and can be surgically removed to solve the underlying problem. If there is no foreign body, anti-infection treatment can be followed.