The hardness inside the incision after appendicitis surgery may be normal tissue healing reaction, local scar tissue, thread knot reaction, incision infection, etc. 1. Normal tissue early healing reaction: under normal circumstances after surgery, local fibrous tissue and connective tissue proliferation are needed for the incision to heal, and the incision will appear as a hard lump. It can be gradually relieved by microwave physiotherapy or hot compresses, and usually recovers in about 1 month. 2. Local scar tissue generation: keloid or other special reasons can make the incision area of fibrous tissue hyperplasia, the formation of local keloid can not disappear on its own, showing hard lumps. Avoid ultraviolet radiation, apply mucopolysaccharides polysulfate cream, use laser and other drugs or physical therapy under the guidance of the doctor. 3. Knot reaction: the surgical suture thread belongs to the foreign body, can be formed in the subcutaneous foreign body granuloma, most of the obvious symptoms, some may appear red, swollen and painful knot reaction, the incision can be touched with a lot of small hard knots. If the knot reaction is serious, the knot can be cut and removed. 4. Incision infection: Inadequate care or other causes of infection, localized redness, swelling, pain, or pus oozing out of the incision, there may also be a hard lump in the incision. The incision needs to be sterilized in time or the sutures need to be removed to drain the pus, and it will take 1 to 2 weeks to recover. Appendicitis after surgery appeared incision hard lump, need to follow the doctor’s recommendations for examination and treatment, so as not to cause other complications.