Comfrey is a perennial herb of the family Comfrey, with upright rhizomes, cylindrical, slightly curved, often branched, and dark red-purple outer skin. Its taste is sweet, salty, cold in nature, returns to the heart envelope and liver meridian, and has the functions of cooling blood, promoting blood circulation, clearing heat, detoxifying and expelling rash. Its main components are shikonin and its derivatives. Modern pharmacological research shows that shikonin has Significant anti-inflammatory, anti-tumor, bactericidal and anti-viral, hepatoprotective and immune regulation effects.