Type I. Good scars: are scars that are linear and flat, running parallel to the skin wrinkles, and the same color as normal skin tone. Type II. Hypertrophic scars: are raised scars, darker in color, and itchy and painful, but the degree of elevation does not exceed the extent of the wound, and will flatten out after a period of time. Type III. General scars: Scars that are slightly raised and a little darker than normal skin color. Type 4: Tattooed scars: The cause is that the wound was infiltrated by foreign objects such as gravel when it was injured and not cleaned, this kind of wound treatment is different from the general scars, the superficial ones can be removed with laser, while the deep ones need to be combined with excision surgery. Scar revision surgery is most effective when the scar is long and thin. The procedure is performed by first removing the scar skin and then suturing it so that the normal skin next to it is gathered and joined. The skin thus sutured is not completely invisible, but it is less unsightly than before. About 6 months after surgery, the red surgical marks slowly change to skin color and become blurred, and after a few more months they are almost invisible. When the scar is too wide, the treatment should be performed by skin grafting. This is a method of removing all the scarred skin and then grafting it onto the original scarred area by thinly cutting the skin from an inconspicuous area such as the buttocks or scalp. However, since the nature of the skin varies from one area to another, special treatment is required to apply a certain amount of pressure to the grafted area for a period of time in order to prevent depressions or protrusions.