Comfrey Root Powder, Symphytum offcinale Comfrey externally, use the powder as a hemostatic agent, and make a poultice for wounds, bruises, sores, and insect bites. The hot pulp of the rootstock makes a good external application for bronchitis, pleurisy, and for the pain and inflammation of pulled tendons. Add the rootstock to your bath water regularly for a more youthful skin. It can also be used to make oil infusions for use in healing balms.