Pain after healing of very shallow wounds may be caused by incomplete healing, bacterial infection, and the presence of residue. 1. Incomplete healing: very shallow wounds may also cause damage to blood vessels and nerves, the soft tissue of the wound site heals, but the damaged blood vessels and nerves are not fully recovered, which may cause pain in the wound. 2. Bacterial contamination: the surface of the wound is healed, but bacteria remain inside the wound, and the bacteria cause an inflammatory response that stimulates the surrounding tissues to produce a painful sensation. 3. Residue: the wound heals but there is a foreign body left inside the wound, the foreign body will continue to stimulate the tissue around the wound and produce pain. This condition should be timely to the hospital, identify the cause of the disease, under the guidance of the doctor symptomatic treatment, avoid unauthorized use of drugs or treatment.