A wound that has been scabbing for 2 years and won’t come off may be caused by scarring or foreign body granuloma. Different causes of treatment principles are different. 1. Scarring: Scarring patients will be due to the abnormal proliferation of local fibrous scarring, scars that can not fall off on their own for a long time, for this type of patients can be used to improve the symptoms such as laser treatment. 2. Foreign body granuloma: If the foreign body is not completely removed from the wound at the early stage of trauma, foreign body granuloma may occur. The main treatment for foreign body granuloma is surgical removal of the overgrown granules, thorough debridement of the wound, and suturing. If the scab does not fall off for a long time, it is an abnormal phenomenon, and you need to consult a doctor in time to find out the cause of the disease, and treat the symptom under the doctor’s guidance, rather than treating it by yourself to avoid infection.