Bark of Shrubalthea Classic Formulas

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Clears damp-heat from the intestines - used for dysenteric diarrhea and lingering damp-heat bowel disorders when heat, mucus, and tenesmus are present but a harsh purgative is unnecessary.
Kills parasites and relieves itching - a classic choice for scabies, tinea, vaginal itching, and damp skin lesions, especially when used externally as a wash or soak.
Dries dampness and addresses lower-burner discharge - used for leukorrhea and genital itching when damp-heat creates irritating secretions or localized inflammation.
Resolves hemorrhoidal or perineal damp-heat irritation - later practice extends Mu Jin Pi to hot, swollen, itchy lesions around the anal or vulvar region.

Mu Jin Pi wash preparations (木槿皮洗方) - traditional decocted washes for scabies, damp itching, tinea, and genital irritation, often combined with other bitter antipruritic herbs.
Regional damp-heat intestinal prescriptions combine Mu Jin Pi with Qin Pi, Huang Bai, or Ku Shen for dysentery and leukorrhea rather than relying on one universally canonical early formula.
Later folk prescriptions also use powdered or wine-processed bark externally for hemorrhoids, itching skin eruptions, and chronic moist lesions.

Later materia medica and teaching compendia describe Mu Jin Pi as a cool, bitter-sweet bark that kills parasites, stops itching, and clears damp-heat from both the intestines and lower burner.
The herb is more prominent in regional and practical dermatologic-gynecologic tradition than in the earliest Shang Han Lun formula canon, which explains the relative scarcity of famous named classical prescriptions.
Traditional usage repeatedly stresses the value of external washing methods, especially for fungal, parasitic, or moist itching lesions.