Danggui is a commonly used Chinese medicinal herb to enrich blood, promote blood circulation and treat blood deficiency pattern and menstrual disorders such as dysmenorrhea and irregular menstrual. 
Dang gui's blood-tonifying and invigorating actions help to heal and relieve pain in swollen, painful abscesses and sores, including chronic suppurative, non-healing sores. It is also an important herb for dry skin conditions from blood deficiency which, in TCM, may generate wind, manifesting as itching.
It should be noted that when using Dang gui, it is necessary to use it in a reasonable dosage according to the specific condition and the advice of herbal medicine