Decoction utensils: Decoction of Chinese medicine is best done in casseroles, earthenware, tile pots, because of their uniform thermal conductivity V, gentle heat, strong insulation around the pot, less water evaporation, less prone to chemical changes and low price. Also available enamelware, stainless steel pots and pans, can not use aluminum pots, iron pots, copper pots and pans to decoct drugs. Decoction water: decoction water is clean, tap water, well water, pure water, distilled water V can be. There are many ways to calculate the amount of water used, but it is common to visually observe the amount of water added to the surface of the medicine when decocting more than 2-3 cm can be; Decoction fire: decoction fire is divided into “martial fire” and “civil fire”. Wuxue refers to a decoction method with rapid fire, fierce fire, fast temperature rise and more water vaporization. Wenhuo refers to a slow, weak fire, the temperature does not change much, slow evaporation of water decoction method. Generally, the decoction is first boiled with martial fire, and then changed to civil fire for another 10-15 minutes. Decoction method: In the general decoction method, the drug is first placed in a container, soaked in cold water for 20-30 minutes, and then heated with a lid on the fire to decoct. First decoct with martial fire, then decoct with civil fire. During the decoction process, pay attention to moderate stirring to avoid paste and also to improve the decoction rate of the active ingredients of the drug. However, the lid of the pot should not be opened too frequently to minimize the loss of volatile components. After decocting for 10-15 minutes on a gentle fire, strain the first decoction; then heat an appropriate amount of water and decoct according to the above method to obtain the second decoction. Mix the two liquids and take as prescribed by the doctor. Dosage: Generally 1 dose per day, divided into 2 doses in the morning and 2 doses in the evening, or divided into 3 doses in the morning, midday and evening; generally the soup is mostly taken with warmth. Dermatological herbs are mostly recommended to be taken after meals.