Alum is a refined product of ore alunite, which mainly contains hydrated potassium aluminum sulfate. After calcination, it is called dried alum. Efficacy: detoxifying and killing insects, eliminating dampness and relieving itching, stopping bleeding and diarrhea, clearing heat and resolving phlegm. Indications: 1, sores, scabies, eczema and itching. 2, vomiting blood and diarrhea. 3, wind phlegm epilepsy, phlegm fever madness. 4, damp-heat jaundice. Usage and dosage: appropriate amount for external use, ground and smeared, or smeared or washed with water. 0.6- 1.5g is taken orally and made into pill powder.