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44. Post-typhoid fever, swelling below the ear (Fayi) occurs due to improper or missed use of sweating and purgative methods, leading to the generation of toxic pathogens. If the area is highly swollen, red, hot, and painful, it is a favorable condition (Shun); conversely, it leads to coma and imminent death. If the toxin is latent and not yet manifesting, the pulse may also be imperceptible, accompanied by profuse cold sweat and limbs as cold as ice. Symptoms such as irritability, thirst, constipation, and purple fingernails closely resemble the "Liaoliao Qing" syndrome in the Three Yin diseases.

[Note] The Fayi toxin caused by typhoid fever arises from improper application of sweating and purgative therapies, causing toxic heat to ascend along with the Ministerial Fire of the Shaoyang channel. If the patient's Yang qi is inherently robust, high swelling, redness, heat, and pain occur, facilitating suppuration; thus, it is considered a favorable condition, treatable with Lianqiao Baidu San (Forsythia Decoction for Resolving Toxins). Alternatively, if the patient's Yang qi is inherently deficient, or if excessive cold medicines have been taken, the toxic heat may be suppressed and郁结 (stagnant), hiding within the interior. Internal attack on the mind causes coma, while external manifestation shows diffuse swelling with unchanged skin color, numbness, hardness, and absence of pain, posing a critical threat to life. Before the toxin manifests, symptoms often mimic the Yang exhaustion syndrome of the Three Yin diseases: an imperceptible pulse, profuse cold sweat, and icy cold limbs. However, the patient remains physically light, eyes clear and bright, with irritability, thirst, constipation, and reddish-purple nails as distinguishing features. This marks the onset of toxin eruption; clinical treatment must not neglect this stage.

45. Anciently known as Huhu (Fox and Delusion), currently referred to as Gan (Gum Disease). "Hu" erodes the anus and genitals, while "Huo" erodes the lips and pharynx. This disease often follows residual toxins after typhoid fever, or occurs after exanthematous diseases, or after chronic abdominal masses and dysentery, presenting similarly in these contexts. Patients exhibit varying colors (red, white, black) on the face and eye corners, inability to close the eyes, excessive sleepiness, tidal fever, hoarseness, ulceration with foul odor. If the stomach qi is strong and the patient can eat, tolerating heavy attacking medications, or if the disease progression is slow, recovery is likely.

[Note] Huhu is the ancient name for conditions such as dental gangrene (Yagan) and chancres (Xiagan), now commonly referred to simply as Gan. Xiagan corresponds to "Hu," eroding the anus and genitals; Yagan corresponds to "Huo," eroding the pharynx, rotting gums, causing tooth loss, cheek perforation, and lip rupture. The pathogenic toxin originates from residual pathogens after typhoid fever, combining with dampness to cause harm. It may also arise after exanthematous diseases or after chronic abdominal masses and dysentery, with similar pathological consequences. Clinical manifestations include fluctuating redness, whiteness, or blackness of the face and eye corners, somnolence with inability to close the eyes, tidal fever, hoarseness, and foul odor from ulcerated areas. If the stomach qi is robust and the patient can ingest food, tolerating potent anti-pathogenic drugs, or if the disease course is gradual, prognosis is generally good.