Tannins in willow act as an astringent to swelling. It also acts as an antimicrobial and a pain reliever. You can make a poultice by mashing up the bark or leaves, or you can make a strong tea and place it over an injury. The tincture can be used as a liniment too, as long as there is not an open wound. 

This has been created to be able to spray into a cloth. Keep refrigerated.