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Cinnamon Twig Decoction (Guizhi Tang) [Note: Text actually describes Gancao Xiexin Tang ingredients but header says Guizhi Tang, translating based on text content]
Licorice Root (Gancao) four liang, Scutellaria Root (Huangqin), Codonopsis Root (Renshen), Dried Ginger (Ganjiang) each three liang, Coptis Rhizome (Huanglian) one liang, Jujube (Dazao) twelve pieces, Pinellia Tuber (Banxia) half sheng.
These seven herbs, with ten dou of water, decoct to obtain six sheng, remove the dregs, decoct again, take warm, one sheng per dose, three doses daily.

Sophora Root (Kushen) one sheng.
With ten dou of water, decoct to obtain seven sheng, use for fumigation and washing, three times daily.

Realgar (Xionghuang).
Grind this single herb into powder, place between two cylindrical tiles, burn, and fumigate towards the anus.

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The *Mai Jing* (Pulse Classic) states: Patients may have erosion of the throat from above due to respiratory qi, or erosion of the anus and yin from below due to lower jiao involvement. Erosion above is called "Huo" (Confusion); erosion below is called "Hu" (Fox). For Hu-Huo disease, Zhu Ling San (Polyporus Powder) is the primary treatment.

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The patient has a rapid pulse (Shu), no fever, slight irritability, silence with a desire only to sleep, and sweating. Within the first three to four days of onset, the eyes are red like those of a turtledove; by the seventh or eighth day, the inner canthi turn black. If the patient can eat, it indicates that pus has formed. Chi Xiao Dou Dang Gui San (Adzuki Bean and Angelica Decoction) is the primary treatment.
[Annotation]
A rapid pulse refers to the pulse of a patient with Hu-Huo disease. A rapid pulse indicates sores and heat. Currently, there is no external body heat, but internal heat from sores exists. Since the heat resides in the Yin aspect, the patient is silent and desires only to sleep. If the heat resides in the Yang aspect, there is slight irritability and sweating. However, in the initial three to four days, when the eyes are red like a turtledove's, this indicates heat accumulating in the blood, causing redness in the canthal vessels. By the seventh or eighth day, when all four canthi turn black, this indicates heat stagnation leading to blood corruption, causing blackness in the canthal vessels. If the patient cannot eat, the toxin remains latent in the interior; if the patient can eat, the toxin has transformed into pus. Therefore, Chi Xiao Dou (Adzuki Bean) is used to drain swelling, Dang Gui (Angelica Sinensis) regulates blood related to sores, and rice gruel harmonizes stomach qi.
[Collected Annotations]
Li [Name Redacted] said: The classics state: If the pulse remains rapid and heat does not resolve, malignant sores will arise. Where is the pus now? Generally, it is in the throat and anal/genital region. Accumulated heat generates parasites, and accumulated heat forms pus; this is also a type of malignant sore.

Adzuki Bean (Chi Xiao Dou) (soaked until sprouts emerge, dried in sun) three sheng, Angelica Sinensis (Dang Gui).
These two herbs, pound into a powder, administer one fangcun bi (square-inch spoonful) with Jiang Shui (fermented grain water), three times daily.

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Yang Du (Yang Toxin) disease presents with a red face, mottled like brocade, sore throat, and expectoration of pus and blood. It is treatable within five days, but untreatable after seven days. Sheng Ma Die Jia Tang (Copious Herb and Turtle Shell Decoction) is the primary treatment.

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Yin Du (Yin Toxin) disease presents with a blue-green complexion, body pain as if beaten with a club, and sore throat. It is treatable within five days, but untreatable after seven days. Sheng Ma Die Jia Tang (Copious Herb and Turtle Shell Decoction), without Realgar (Xionghuang) and Sichuan Pepper (Shujiao), is the primary treatment.
[Annotation]
Balance of Yin and Yang is Zheng Qi (Upright Qi); imbalance of Yin and Yang is Xie Qi (Evil Qi); alteration of Yin and Yang is Yi Qi (Abnormal Qi). Zheng Qi refers to the normal climate of the four seasons; contracting illness from it is slow and superficial. Xie Qi refers to irregular climates of the four seasons; contracting illness from it is rapid and critical. Yi Qi refers to unusual epidemic pestilence; contracting illness from it leads to sudden death. Thus, if untreated beyond five days, it is because the Five Zang organs transmit the pathogen, all becoming affected. This qi, if invading the Yang aspect of humans, becomes Yang Du; if invading the Yin aspect, it becomes Yin Du. This is not the Yin Du and Yang Du discussed by later authors referring to extreme Yin Cold and extreme Yang Heat. Observing the prescribed formulas, they mainly consist of Sheng Ma (Copious Herb), Gan Cao (Licorice), Dang Gui (Angelica), Bie Jia (Turtle Shell), Shujiao (Sichuan Pepper), and Xionghuang (Realgar), without using major cold or hot drugs. Thus, it can be known that Zhang Zhongjing’s discussion of Yin Du and Yang Du did not refer to extreme Yin Cold or extreme Yang Heat. These two conditions correspond to what is currently commonly known as Sha Syndrome (Sand Poison). Yang Du ultimately belongs to Yang pathogens, hence presenting with red face, mottled skin like brocade, and expectoration of pus and blood (heat signs). Yin Du ultimately belongs to Yin pathogens, hence presenting with blue-green face and body pain as if beaten (cold signs). Both conditions involve sore throat because the pathogen enters from the mouth and nose downward into the throat, causing pain.
[Commentary]
From this, we can infer that wherever the pathogen passes, there is pain. Thus, those infected by this qi suffer not only sore throat and body pain, but even severe abdominal cramping, extreme distension, sudden emergence of blue-purple collateral vessels throughout the body, fingernails and toenails turning indigo-blue, lockjaw, mental confusion, and death imminent. If one claims the pathogen must enter through the skin and hair, there would be no such rapid onset. It undoubtedly enters through the mouth and nose, descending into the throat. Moreover, Yin Du removes Realgar and Sichuan Pepper, which must be a transcription error. Therefore, treating this condition, one need not ask whether it is Yin or Yang, but should prick the Chi Ze (LU5), Wei Zhong (BL40), and areas where collateral vessels suddenly emerge on the ten fingers of the hands to bleed. For mild cases, use Gua Sha (scraping) method, followed immediately by Fu Zi (Prepared Aconite), Chuan Wu (Prepared Sichuan Aconite), Wu Zhu Yu (Evodia Fruit), Ding Xiang (Clove), Sheng Gan Jiang (Raw Dried Ginger), and Gan Cao (Licorice); add Renshen (Codonopsis/Ginseng) for deficiency. Many survive.
[Collected Annotations]
Wang Lü said: Although Zhang Zhongjing named Yin Du, his description of symptoms was merely blue-green face, body pain, and sore throat, without mentioning extreme Yin Cold. His Sheng Ma Die Jia Tang (Copious Herb and Turtle Shell Decoction) does not use major hot drugs. Thus, it is known that Zhang Zhongjing’s Yin Du was not a Yin Cold disease, but rather the invasion of heaven and earth’s toxic abnormal qi into the Yin meridians, hence called Yin Du! Later authors called extreme Yin Cold conditions Yin Du, citing Zhang Zhongjing’s descriptions of blue-green face, body pain as if beaten, and sore throat, yet prescribing Fuzi San (Aconite Powder) and Zhengyang San (Correct Yang Powder). I believe that while extreme Yin Cold conditions can certainly be named Yin Du, this is not the original intent of Zhang Zhongjing’s naming. The Yin Du described by later authors and that described by Zhang Zhongjing are naturally different; how can they be conflated? Generally, the Yin Du described by later authors results merely from internal injury from cold foods, sudden exposure to cold, excessive consumption of cold-cooling drugs, or internal and external cold damage. It is not caused by heaven and earth’s toxic abnormal qi.
Li [Name Redacted] said: Zhao Xianke stated: This Yin and Yang Er Du (Two Toxins) is contracted from heaven and earth’s epidemic abnormal qi, contagious within families, known as Shi Yi Zheng (Seasonal Epidemic Syndrome). The phrase "old and young take another dose" in the formula confirms this.