Comfrey oil is a common topical drug for clinical treatment of burns and scalds, which can be detected on the website of the State Food and Drug Administration as a national medicine approved product. The formula is comfrey, angelica, elm, scutellaria, yellow and white flowering herbs, angelica dahurica, ice chips and other herbs, extracted by heating with sesame oil, and its function is to cool the blood and detoxify the body, resolve decay and regenerate the muscle, mainly treating water and fire burns, frostbite ulcers, and long-standing failure to close the mouth. Prevention is mainly for the treatment of diaper rash, skin ulcers, eczema in infants and children, cooling the blood, invigorating the blood as well as detoxifying and rash-transferring effects. Use directly on the affected area, or impregnated with sterile gauze and put on the wound, change the medicine every 2 days, if there is an infected wound, you can apply the medicine after removing the secretion, it is necessary to pay attention to not ignore the skin folds and so on. When using comfrey oil, beware of allergies to this herb. The first time you use it, you should apply a small amount and test it.