There are no studies showing that alum is toxic, but if alum is used in excess, it may cause poisoning. Therefore, it is recommended to use this medicine under the guidance of a traditional Chinese medicine practitioner and according to the correct dosage. Alum belongs to the name of traditional Chinese medicine, its taste astringent, acid, cold, external use has detoxification and insecticide, dry dampness to stop itching (through the treatment of dry dampness to stop itching) effect; internal use has to stop bleeding and stop diarrhea (stop bleeding and diarrhea), to remove the wind and phlegm effect. Alum is used externally for eczema, scabies, prolapse of anus, hemorrhoids, etc.; internally for prolonged diarrhea, blood in stools, leakage (excessive menstrual flow or dripping), epilepsy and madness. Alum has the efficacy of collecting dampness and converging sores, stopping bleeding and resolving corrosion, and is used for eczema and wet sores, prolapse of anus, hemorrhoids, pus in the ear canal, itchy vagina, epistaxis (nosebleed), epistaxis, and so on.