Cosmetic stitches are usually not completely seamless. Even if the skin wound is sewed carefully, scars can't be avoided. However, cosmetic stitches can make the scar as small or inconspicuous as possible through some plastic techniques, and minimize the chance of scar formation. Generally, the needle marks of cosmetic stitching are not too obvious. Moreover, the molecular structure of the cosmetic thread is stable, the surface is smooth, the damage to the skin is minimal, and the thread hole scar will not be formed. But whether there will be scars is also related to factors such as whether the wound is neat, whether the pollution is serious, whether it is complicated with infection, and whether it is scar constitution. In the later stage, laser and other treatment measures can be used to remove the scars formed after trauma to the maximum extent.