Yarrow is a great herb to keep on hand as a first aid salve for minor cuts and scrapes. To use it, simply clean the wound and then apply the yarrow salve. The salve will help to close the wound quickly. Just be sure not to use it on puncture wounds or severe wounds. For those, you'll need to see a doctor or head to the emergency room. Minor cuts and scrapes, though, are perfect for this salve.