Be sure to use fresh mugwort leaves. I used to be a serious urticaria patient, and I got sick as soon as I touched cold air. The main symptoms are rash on my knees, wrists and knuckles, stiff and itchy joints. Later, I boiled highly brewed white wine with fresh folium Artemisiae Argyi. I drank 50 ml of medicinal liquor three times a day for seven days. That winter, my condition improved. But it recurred the next summer. Then I stayed up for half a month for a few Jin of mugwort. I haven't been sick for ten years. (Health.com sees the specific ratio:100g liquor+50g fresh folium Artemisiae Argyi until 50g medicinal juice. The concentration ratio of my boiling is much higher than this ratio)