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。
干癣，其特征是皮损边缘清晰隆起，皮肤干枯瘙痒，搔抓后有白色皮屑脱落。这主要是由于风湿邪气侵袭腠理（皮肤纹理及皮下组织间隙），又遇寒湿之气与体内血气相互搏结而形成的。如果风毒之气较重而湿气较轻，风邪就会深入肌肤，导致患处没有渗出液，从而形成干癣。病变部位甚至可能滋生虫邪。
治疗干癣，表现为搔抓后白色皮屑纷起的，使用黄连散方。
黄连（一两，去除须根） 藜芦（半两，去除芦头） 川大黄（一两） 干姜（半两，生用切碎） 茹（一两，注：此处原文似缺字或通“如”，结合语境及常见配伍，疑为“如”或特定药材名误植，依原文直译） 莽草（一两）
以上药物，捣碎过细罗成为散剂。加入一斤猪脂，用慢火煎制成膏状。滤去药渣，盛放在瓷器中保存。先用新布擦拭患处使其轻微破损，然后涂抹药物，没有不能治愈的。
治疗干癣瘙痒不止的，适宜涂抹胡粉散方。
胡粉 黄连（去除须根） 蛇床子 白蔹（以上各半两）
以上药物，捣碎过筛成为粉末。用面脂调和后涂抹。若患处湿润则干燥贴敷。
治疗干癣瘙痒疼痛不止的方剂。
草乌头（一分） 野狼牙（一分） 斑蝥（七枚）
以上药物生用，捣碎过细罗成为散剂。用口脂调和，用竹篦子刮破患处后涂药，反复揉搓使药力渗入肌肉，待流出黄水，三两天即可痊愈。
另一个方子。
斑蝥（五月五日采集七枚） 麝香（半钱）
以上药物，一起研磨成粉末，用醋调和涂抹在疮面上，流出少量黄水后即可痊愈。
又一个方子。
川乌头（二枚，生用） 干蝎（五枚）
以上药物，捣碎过筛成为粉末，用面油调制成膏状，涂抹患处。
治疗干癣无论病程长短，神效方。
水银（半两） 芜荑（半两，研末） 胡粉（半两） 花胭脂（半两）
以上药物一起研磨，加入炼好的腊月猪脂四两，研磨至水银星点完全消失。先用淘米水清洗患处，擦干后再涂抹。
治疗干癣多年积存痂皮，搔抓后流出黄水，每逢阴雨天就瘙痒的方剂。
巴豆（十枚肥大的）
先在炭火上烧巴豆，令油脂完全渗出。然后在乳钵内，用少许酥油和研如膏状。薄薄地涂抹。不超过一两次即可痊愈。
又一个方子。
取槲树的白皮涂抹。
又一个方子。
取桃树的白皮，捣烂至极，用醋调和后涂抹。
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.