(Symphytum officinale) aka - Knitbone, Bruisewort, Woundwort.
Comfrey contains ‘allantoin’ which is a cell proliferant, that is, it stimulates new cell growth, increases cell production and thus supports rapid healing. Comfrey has been used historically on any part of the body that has been injured. Comfrey (called “the knitter and healer”) stops hemorrhaging and bleeding.  It aids in soothing inflammation and when used as a poultice can be applied to sore breasts, burns, wounds, swelling, and bites. Comfrey is used externally to promote the healing of sores, muscles, bones and other tissues.