Will it cause scars? The size of the scar is related to whether you have a scar personally. Some people have big scars, but the wounds will leave scars. It is best not to disinfect with alcohol, but to use PVP iodine or hydrogen peroxide, because alcohol is more irritating. If the wound is shallow, just once a day. Pay attention to protect the wound from infection. If the wound is serious and there are stitches or something, you can take some anti-inflammatory drugs. I hope it helps you!