Vaseline swab is composed of degreased sterile gauze and Vaseline. In patients with trauma, if the wound has more bleeding, or the wound is more polluted, with more bleeding and exudation, covering the Vaseline swab in this case can prevent bacteria from contacting the skin, thereby reducing the possibility of infection. In addition, Vaseline swab can also promote the growth of granulation tissue on the wound surface and promote wound healing. If the wound has a lot of bleeding, it may form scabs when bandaging with ordinary swab. The scabs may stick to the swab. The application of petroleum jelly swab will avoid this situation. It will not be correct when dressing the wound. The wound produces irritation.