TCM Properties

Traditional Use

Dries Dampness, relieves itching, and kills parasites for external use - classically applied to weeping eczema, scabies, tinea, genital itching, and damp skin lesions that need a stronger drying form than raw alum solution.
Shrinks tissue and stops bleeding - used topically for bleeding hemorrhoids, prolapse, ulcerated tissue, and small oozing lesions where the dehydrated processed form offers stronger astringency.
Promotes tissue closure and healing of sores - used in external powders for chronic ulcers, damp erosions, and lesions that need both desiccation and regeneration support.

Compared with raw Bai Fan or Ming Fan, Duan Bai Fan is the more strongly dried, dehydrated, and externally oriented form after heating removes the water of crystallization.
Modern practice overwhelmingly prefers it for topical powders, washes, and blended external formulas rather than for routine internal use.

Ku Fan topical powder - the classic dried-alum application for bleeding hemorrhoids, weeping eczema, and damp erosive sores.
Ku Fan with Ku Shen or sulfur-containing external medicines - traditional pairing strategy for stubborn itching, parasites, scabies, and fungal skin disease.
Ku Fan with Er Cha or other astringent wound powders - used for chronic ulcers and lesions that need both bleeding control and tissue regeneration.

Me & Qi identifies alum under the Ming Fan entry and lists Ku Fan as the processed dried form, preserving the broader alum tradition while distinguishing the preparation state.
Ben Cao Gang Mu, as already summarized in the raw Bai Fan record, explicitly notes that Ku Fan has greater astringency after calcination and is preferred for external use in sores and hemorrhoids.
PREPARATION NOTE: Duan Bai Fan (煅白矾) and Ku Fan (枯矾) refer to the same clinical idea of dehydrated, calcined alum. This file keeps the pinyin imported by the spreadsheet while documenting the more common classical synonym.

Dehydrated potassium aluminum sulfate (calcined alum mineral) - the processed astringent core of Duan Bai Fan
Aluminum ions (protein-precipitating inorganic species) - central to the local contracting and secretion-reducing effect
Sulfate ions (desiccating inorganic component) - contribute to the drying and antimicrobial environment
Low-water porous mineral matrix created by calcination - helps explain why the processed form is more friable and topically absorbent than raw alum crystals

Local hemostatic use - conventional potassium alum irrigation has long been used to control bleeding on inflamed mucosal surfaces, including hemorrhagic cystitis, reinforcing the classical astringent and bleeding-arresting reputation of alum preparations (PMID 2193606)
Antifungal activity - published clinical-veterinary literature reported control of mycotic dermatitis with potassium aluminium sulfate, supporting the long-standing external use of dried alum for fungal and damp skin disorders (PMID 14331483)
Mechanistic pharmacology on alum rather than specifically calcined alum found smooth-muscle inhibitory effects in rabbit tissue, offering a modern clue to older internal alum uses even though Duan Bai Fan itself is now chiefly external (PMID 25012630)

Routine internal use without professional supervision
Dry, non-weeping lesions that do not need a strongly astringent mineral
Application to large deep wounds or delicate mucosa without careful processing and dose control

Duan Bai Fan is the more desiccating processed form of alum and is chiefly an external medicine in modern practice
Overuse can irritate fragile skin, mucosa, or ulcer bases despite its tissue-shrinking benefits
Like other alum products, poorly regulated material raises impurity and cumulative aluminum-exposure concerns
MSK page not found - drug interaction data not available from Memorial Sloan Kettering integrative medicine database