There is no standardized criteria for how deep a wound should be stitched, as it needs to be determined by the location of the wound as well as the level of injury and cleanliness. If it is a relatively small facial wound, it may not be very deep, but if there is a separation of the skin, poor skin alignment as well as articulation, the healing may also leave a more obvious scar, in which case cosmetic sutures are usually required. If the skin wound is deeper, with a depth exceeding the entire dermis and exposing subcutaneous tissue, prompt suturing is usually required to avoid the formation of larger scar tissue. If the wound is more serious, with damage to local blood vessels as well as nerve blocks, etc., the damaged subcutaneous tissue will have to be repaired, in addition to suturing. However, if the wound is shallow, only the epidermis is damaged, did not hurt the dermis, generally do not need to be sutured, carefully do a good job of disinfection, bandaging work can be. It should be noted that if the wound is large and deep, if it is infected or seriously contaminated, it usually can not be directly sutured, you need to first clean, disinfection treatment before suturing. If the skin wound is more serious, it is necessary to go to the regular hospital in time, let the professional doctor to deal with.