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The *Zhengzong* (Orthodox Standard) states: Longquan abscess arises in the center of the Renzhong acupoint, while Huxu toxin arises at the Dijiao (lateral mandible). These two toxins result from the sudden invasion and binding of external pathogens to the area where the Kidney Meridian and Du Meridian distribute and intersect. Initially, a nodule appears, followed by swelling and pain, gradually developing into chills and fever. In severe cases, nausea, dry heaving, vomiting, and neck swelling occur.

It further states: This condition often occurs in individuals with robust Yuan Qi (Original Qi), so medication is often unnecessary as it may resolve spontaneously.

It also states: At the initial stage, it is advisable to pierce the apex of the lesion with a thread needle, apply a Chan Su (Toad Venom) cake covered by a plaster, to provide an outlet for the toxin to drain. For swelling around the periphery, Yijian Jinhuang San (Ruyi Golden Yellow Powder) should be applied topically.

It further states: Moxibustion is contraindicated at this acupoint.

The *Guiyi Fang* (Ghost's Lost Formula) states: The area below the nose (one spot) and the Renzhong (two spots) are referred to as "facial hair eruption." This ailment is often caused by plucking facial hair, allowing external wind pathogens to invade and coagulate. The attacks are irregular, with alternating chills and fever. This too is harmful to the human body.

Wang Kentang states: Zidu carbuncle arising at the Dijiao is caused by Wind-Heat affecting the Foot-Yangming Stomach Meridian. If palpation reveals a root, accompanied by insensibility or numbness/itching of the flesh, severe chills and fever, mental restlessness, and vomiting/reversal of qi, it is classified as Ziding (Facial Hair Ding). (*Yixue Zhunsheng*)

Shen Douyuan states: Zidu is caused by accumulated heat from wind pathogens manifesting in the Spleen Meridian; Xudu (beard toxin) and Randu (cheek beard toxin) both manifest in the Hand-Yangming Large Intestine Meridian. (*Qixuan*)

The *Xinfa* (Essential Methods) states: Longquan abscess arises at the Shuigou acupoint (i.e., Renzhong); Huxu toxin, also known as Hu Zi toxin or Keyong (chin carbuncle), presents with red, swollen, painful symptoms, ruptures quickly, and is easy to treat. It is also called Chengjiang abscess, which presents with hardness, swelling, and pain, ruptures slowly, and is difficult to treat. Both arise from excessive consumption of roasted/grilled foods, leading to accumulated heat in the Stomach and Kidney meridians that attacks upward along the Ren Meridian.

Shen Douyuan states: Yangxu Ding (Goat Beard Ding) results from conflicting anger flowing into the meridians, manifesting in the Heart Meridian. Initially, the root is deep, shaped like a millet seed or small bean; after three to four days, the face and eyes swell; after five to six days, alternating chills and fever occur; after seven to eight days, fatigue and headache appear. If vomiting, coma, and asthma develop, none of ten patients will survive. This arises in the beard of the lower chin. Treatment at the initial stage follows the protocols for Ding Sores (Ding Chuang) described in the Ding Sores chapter (*Qixuan*).