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To treat chancre (ulcerative sores of the genitals): Use ashes of Juncus effusus (rush pith), mixed with a small amount of Calomel (Mercurous Chloride) and Moschus (Musk). Apply dry powder directly to the lesion for immediate effect.
Another prescription: Use refined white alum, Calomel, and Moschus ground into fine powder. First, rinse the area clean with fermented rice water, pat dry, and apply the powder to the sore, two to three times daily.

To treat gan sore (chancre-like ulcers): Use three qian of ash from roasted silkworms, mixed with a small amount of Calomel and Boswellia carterii (Frankincense), ground into fine powder. First, wash the area clean with warm fermented rice water, dry it, and sprinkle the powder.

To treat chronic gan sores that do not heal: Use two liang of Haifushi (Pumice Stone), heated red-hot and quenched in vinegar multiple times, combined with one liang of Lonicera japonica (Honeysuckle). Grind into fine powder. Take two and a half qian per dose, twice daily.

To treat genital chancre: Use equal parts of Coptis chinensis (Coptis Rhizome) and Phellodendron amurense (Phellodendron Bark). Soak them in the bile of two pigs. Then, heat a tile or brick until red-hot on fire, place the herbs on top, and bake them until dry.
Another prescription: Use Lithargyrum (Lead Monoxide), Coptis chinensis, Phellodendron amurense, and Calomel ground into fine powder, and sprinkle on the lesion. Wash with a decoction of salt mugwort leaves.

To treat swelling of the genital chancre that does not subside: Use equal parts of Saposhnikovia divaricata (Divaricate Ledebouriella Root), Schizonepeta tenuifolia (Schizonepeta Spike), Glycyrrhiza uralensis (Licorice Root tip), and Achyranthes bidentata (Achyranthes Root). Decoct in water for fumigation and washing; the swelling will subside.
Another prescription: Use Yiyuan San (Benefit Primordial Powder) added with Saposhnikovia divaricata, Schizonepeta tenuifolia, and Polygonum multiflorum (Fo-ti Root). Decoct in water and wash the area while warm.

To treat infectious gan sore (zhu-gan chuang): Mix Calomel and Shao Fen (a type of lead-based cosmetic powder) evenly and sprinkle on the lesion.

To treat gan sore: Use Calcined Calamine (Lignite Zinc Carbonate), calcined and quenched in vinegar, ground into fine powder. Mix with oil and apply topically. Adding Children's Tea (Camellia sinensis buds processed with tea polyphenols) is particularly effective.
Another prescription: Mash fresh Ginkgo biloba seeds and apply to the affected area.
Another prescription: Burn olives to ash, grind into powder, mix with oil, and apply.
Another prescription: Stir-fry Phellodendron amurense with egg white three to five times, then grind into powder. Mix with oil for application; if the area is moist, apply dry powder.

To treat lacquer dermatitis (qi chuang): Apply crab juice to the affected area for immediate cure.
Another prescription: Decoct Magnesium Sulfate (Mirabilite) in high concentration and wash the area.
Another prescription: Decoct Alum in water and soak/wash the area.
Another prescription: Decoct Cunninghamia lanceolata (Chinese Fir Wood) in water and wash; this is effective.
Another prescription: Decoct Daphne genkwa (Daphne Flower) leaves in water and wash.
Another prescription: Mix Hematite (Native Iron Oxide) powder with water and apply as a poultice.
Another prescription: Apply Capra hircus milk (Goat Milk) to the area for cure. This method also treats herpes zoster (spider sore); drinking it internally yields even better results.

For lacquer dermatitis, frostbite, and dog bite wounds: Chew Sorghum vulgare (Sorghum grains) until mashed and apply as a poultice.

To treat chronic lacquer dermatitis that does not heal: Mash Lacquer Tree leaves (Rhus verniciflua) and apply as a poultice to the affected area for immediate effect.