✵The TCM herbalism is also known as pharmaceutics of Traditional Chinese Medicine, or Chinese pharmaceutics, is the branch of health science dealing with the preparation, dispensing, and proper utilization of Chinese herbs. It is majorly composed of Introduction of Chinese Medicinals, Classification of Chinese Herbs, Formulas, and Patent medicines.
Classifications of Herbs:Herbs for External Use.
Introduction: Herbs for External Use: an agent or substance herbs that used externally for external disease.
✵Till the date March 19th, 2020, there are totally  kinds of common TCM herbs,  kinds of related plant species,  kinds of related insect species,  kind of minerals, are recorded in this category. These herbs for external Use are briefly introduced separately:
Brief Introduction: The herb Alumen is a crystalline mineral salt, hydrated potassium aluminum fulfate, used (1).externally to kill parasites, arrest discharges and relieve itching in cases of scabies, tinea, neurodermatitis, and eczematous lesions, and (2).internally to dispel wind-phlegm for treating epilepsy and mania. The herb is commonly known as Alumen, Alum, Alunite, white alum, Bái Fán.
✵Common official herbal classics and other famous herbal classics defined the herb Alumen(Alum) as crystalline mineral processed and purified from the mineral alum stone(Alunite). This commonly used mineral is introduced as:
Alumstone(Alunite): It is commonly known as alum stone mineral, alunite, calafatite, or Míng Fán Shí. Trigonal system. The crystals are small rhombohedral or platelike, usually dense, granular, earthy, etc. Color is colorless, white, often with light yellow and light red color. Streaks white. Luster glassy, cleavage surface sometimes with microstrip pearl light, lumpy luster dim or microstrip waxy luster. Transparent to translucent. Cleavage parallel (0001) is incomplete. The fracture crystals were shell-shaped; The block is multipatch, jagged, sometimes earthy. Hardness is 3.5~4. The proportion of 2.6~2.8. Crispy.
Natural Environment: alkaline feldspar metamorphism by low-temperature sulfate solution, mostly in volcanic rocks. It is distributed in Gansu, Hebei, Anhui, Shanxi, Hubei provinces of China.
Trait identification: The product is irregular crystallization-shaped block. Colorless or white. Transparent or translucent, glassy luster. Surface slightly smooth or uneven, with a fine longitudinal edge, and with white powder. Hard and brittle, easy to break. Smell is small, the taste is small sweet and extremely astringent. The herb which blocks are large, colorless, transparent, without impurities is better.
Alumen Ustum(Calcined Alumen).
Brief Introduction: The herb Alumen Ustum is calcined potassium aluminum sulfate, used to arrest discharges, promote the healing of ulcers, stop bleeding, and cause cauterization, externally for the treatment of eczema, excessive leukorrhea with pudendal itching, and nasal polyp, and internally as an astringent for chronic diarrhea and bloody stool. The herb is commonly known as Alumen Ustum, Calcined Alumen, Kū Fán.