graze = a small injury where the surface of the skin has been slightly broken by rubbing against sth
disposable = made to be thrown away after use
gauze = a thin cotton fabric used for covering and protecting wounds
swab = to clean or remove liquid from a wound
casualty = a person who is killed or injured in war or in an accident
rinse = to wash sth with clean water only, not using soap
grit = very small pieces of stone or sand