Scars with long flesh bumps may have granulation tissue repair, hypertrophic scar or keloid formation, etc. resulting in different degrees of skin changes. 1. Granulation tissue repair: when the skin is damaged such as cut, surgery, etc., granulation tissue can appear 2-3 days after the tissue damage, in order to repair the damaged tissue, protect the wound, fill the gap, and gradually grow and advance from the periphery to the center, and ultimately gradually transformed into keloid tissue. 2. Hypertrophic keloid scar: it is only a kind of keloid scar, which mostly occurs in the surgical incision skin, and gradually appears red hard cord-like elevation in the healing area of the incision, and the lesion does not exceed the scope of the original lesion, and there is no crab-foot-like change, and it can naturally subside after about one year. 3. Keloid: for people with keloid, when the scar tissue proliferates excessively, it can expand irregularly to the surrounding skin, forming a keloid, which appears higher than the skin surface, and spreads to the surrounding area with crabfoot-like changes. Skin injury attention to prevent infection, when there is excessive proliferation of skin connective tissue to seek timely medical treatment, symptomatic treatment.