Crushed iron filings inside the finger are most commonly seen in open wounds with foreign body retention, which should be treated by thorough debridement to remove the foreign body residue inside the wound, followed by proper bandaging and dressing change. Since the iron filings may be contaminated with bacteria and may cause infection (dactylitis, etc.) if they remain in the finger, a debridement should be performed to remove the residual iron filings. A preoperative frontal and lateral X-ray of the finger is required to clarify the location and amount of broken iron. Usually, the skin around the wound should be cleaned first, and then the wound should be rinsed repeatedly with saline, and if the wound is small, it can be enlarged appropriately to remove the foreign body. As the wound is superficial, usually no suture is needed. After removing the foreign body, use medical alcohol or iodine to sterilize the wound again, then use sterile dressing to cover the wound and change the dressing regularly. Pay attention to protect the wound dry and clean, usually a few days can be healed. To prevent tetanus infection, an injection of tetanus antitoxin is required before and after surgery. After the operation, you should also take amoxicillin, cefaclor and other antibiotic treatment to prevent infection.