夫干癣。但有棱廓。皮枯痒。搔之白屑出是也。皆是风湿邪气。客于腠理。复值寒湿与
血气相搏所生。若其风毒瓦斯多。湿气少。故风入深。故无汁。为干癣也。其中亦生虫。
治干癣。搔之白屑起。黄连散方。
黄连（一两去须） 藜芦（半两去芦头） 川大黄（一两） 干姜（半两生锉） 茹
（一两）
莽草（一两）
上件药。捣细罗为散。入猪脂一斤。以慢火煎成膏。滤去滓。收于瓷器中。先以新布揩
拭疮上令伤。然后涂药。无不瘥者。
治干癣痒不止。宜涂胡粉散方。
胡粉 黄连（去须） 蛇床子 白蔹（以上各半两）
上件药。捣罗为末。面脂调涂。湿即干贴之。
治干癣痒痛不止方。
草乌头（一分） 野狼牙（一分） 斑蝥（七枚）
上件药生用。捣细罗为散。以口脂调。用竹篦子刮破涂药。熟揩入肉。候出黄水。三两
日瘥。
又方。
斑蝥（五月五日取七枚） 麝香（半钱）
上件药。都研为末。以醋调涂在疮上。出少多黄水瘥。
又方。
川乌头（二枚生用） 干蝎（五枚）
上件药。捣罗为末。用面油调作膏。涂之。
治干癣无问年月。神效方。
水银（半两） 芜荑（半两末） 胡粉（半两） 花胭脂（半两）
上件药都研。入炼了腊月猪脂四两。研令水银星尽。先以泔清洗疮上。拭干然后涂之。
治干癣积年生痂。搔之黄水出。每逢阴雨即痒方。
巴豆（十枚肥者）
上于炭火先烧之。令油出尽。即于乳钵内。以少许酥和研如膏。薄涂之。不过一两度愈
又方。
上以野狼毒。醋磨涂之。
又方。
上取槲树白皮涂之。
又方。
上取桃树白皮。捣令极烂。以醋调涂之。
又方。
斑蝥（半两微炒）
上捣罗为末。蜜调。薄涂即瘥。
又方。
上取青葙子末。以口脂调。先用浆水洗净后敷之。
Dry tinea (Gan Xuan) is characterized by distinct, raised borders of the lesions, dry and itchy skin, and the shedding of white dandruff-like scales upon scratching. This condition arises primarily from wind-dampness pathogenic factors invading the couli (interstices of the skin and subcutaneous tissue), compounded by cold-dampness clashing with the body's blood and qi. If the wind-toxic qi is predominant while dampness is scant, the wind pathogen penetrates deeply into the skin, resulting in a lack of exudate, thus forming dry tinea. Parasitic worms may also generate within the affected area.
For treating dry tinea presenting with white scales rising upon scratching, use the Huanglian San (Coptis Powder) formula:
Huanglian (Coptidis Rhizoma, 1 liang, remove rootlets); Lilu (Veratris Radix, 0.5 liang, remove rhizome head); Chuan Dahuang (Rhei Radix et Rhizoma, 1 liang); Ganjiang (Zingiberis Rhizoma, 0.5 liang, raw and chopped); Ru (1 liang); Mangcao (Arisaematis Cum Bile, 1 liang).
The above herbs are finely ground and sieved to form a powder. Add 1 jin of lard and simmer over low heat until it forms an ointment. Filter out the dregs and store in a porcelain vessel. First, wipe the lesion with a new cloth to cause slight abrasion, then apply the medicine. Cures are invariably achieved.
For dry tinea with unrelenting itching, it is suitable to apply the Hufen San (Lead Carbonate Powder) formula:
Hufen (Galena/Lead Carbonate); Huanglian (Coptidis Rhizoma, remove rootlets); Shechuangzi (Cnidii Fructus); Bailian (Paeoniae Rubra Radix or Ampelopsis Radix - context suggests Paeoniae Radix Alba or similar, here translated as Bai Lian). (Each of the above: 0.5 liang).
The above herbs are ground and sieved into a fine powder. Mix with mianzhi (fat derived from flour/starch) for topical application. If the area is moist, apply when dry.
Formula for unrelenting itching and pain in dry tinea:
Caowutou (Aconiti Kusnezoffii Radix, 1 fen); Yelangya (Saposhnikoviae Radix or similar, literally Wild Wolf Tooth, likely referring to a specific herb like Saposhnikovia or similar acrid herb, kept as Yelangya); Banmao (Mylabris, 7 pieces).
Use the above herbs raw. Grind finely and sieve into a powder. Mix with kouzi (lip balm/fat). Use a bamboo spatula to scrape the lesion open before applying the medicine. Rub vigorously to penetrate the flesh. Wait for yellow fluid to exude; cure within two to three days.
Another formula:
Banmao (Mylabris, 7 pieces collected on the fifth day of the fifth lunar month); Shexiang (Moschus, 0.5 qian).
Grind the above herbs together into a powder. Mix with vinegar and apply to the lesion. Cure occurs after a small amount of yellow fluid is discharged.
Yet another formula:
Chuan Wutou (Aconiti Radix, 2 pieces, raw); Ganxie (Scorpio, 5 pieces).
Grind the above herbs into a powder. Mix with mianyou (flour oil/fat) to make an ointment. Apply topically.
Miraculous Effect Formula for dry tinea regardless of duration:
Shuiyin (Mercurius, 0.5 liang); Wuyi (Chrysanthemi Indici Fructus, 0.5 liang, powdered); Hufen (Galena/Lead Carbonate, 0.5 liang); Huanyanzhi (Flower Rouge/Vermilion, 0.5 liang).
Grind all ingredients together. Add 4 liang of refined lard from the twelfth lunar month. Grind until the mercury stars disappear completely. First wash the lesion with rice water, dry it, and then apply.
Formula for chronic dry tinea with accumulated crusts, yellow exudate upon scratching, and itching exacerbated by rainy weather:
Badou (Crotonis Fructus, 10 plump seeds).
Roast the Badou over charcoal fire until the oil is fully expressed. Then, in a mortar, grind with a small amount of su (clarified butter/ghee) into a paste. Apply thinly. Cure within one or two applications.
Another formula:
Take Yelangdu (Stellerae Chamaejasmi Radix), grind with vinegar, and apply.
Another formula:
Take the inner bark of the Quercus dentata tree (Hushu Baipi) and apply.
Another formula:
Take the inner bark of the Prunus persica tree (Taoshu Baipi), pound until extremely pulpy, mix with vinegar, and apply.
Another formula:
Banmao (Mylabris, 0.5 liang, lightly stir-fried).
Grind and sieve into a powder. Mix with honey and apply thinly for cure.
Another formula:
Take Qingxiangzi (Celosiae Semen) powder. Mix with kouzi (lip balm/fat). First wash the area with jiangshui (fermented grain wash/water), then apply.