Alum, also known as calcined alum, there is no such thing as a special method of external use, external use of commonly used methods of research and powdered sprinkle or dressing, astringent astringent sores, muscle and other efficacy, used for eczema and eczema sores and other certificates. Calcined alum is alum heated and dissolved and calcined to dry. There is no so-called external special effects method, external use can be powdered sprinkle or dressing. The efficacy of calcined alum is to regenerate muscle, stop bleeding and transform rot, collect dampness and astringent sores, used in eczema and wet sores, epistaxis, epistaxis (nosebleed), yin-raising and band-aiding, pus in the ears, nasal polyps and other cases. Alum is astringent in flavor and difficult to be taken, and should not be taken internally in excess, as it is prone to vomiting; people with weak body and weak stomach should be cautious in taking it. If you need to use alum (calcined alum), to be in the Chinese medicine practitioner under the identification of medication, do not apply on their own, to avoid causing adverse consequences.