Comfrey is a medicinal herb. Comfrey tea can be used as a treatment for upset stomach, ulcers, heavy menstrual periods, diarrhea etc. It is also used as a gargle for sore throat and gum-diseases. Balm prepared using comfrey roots can be used to treat conditions like blemishes, varicose veins, ulcers, swellings, gout, arthritis, burns, and phlebitis. A decoction prepared using comfrey roots can be used to treat skin conditions like eczema, acne, psoriasis, and boils.