Oftentimes referred to as knitbone, comfrey has long been used for its assisstance in bringing about the relief of such ailments as chronic back pain, minor wounds, reducement of inflammation and pain, and skin healing. It is also believed to abet in the healing of sprains, strains, muscle pains, arthritis, bruises, and fractures. Remember, comfrey is only to be used topically and within a short period of time. It should not be used on broken skin or open wounds and not at all if you have any sort of liver disease, cancer, or if you are pregnant or nursing.