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[Supplementary Discussion]
The term "Five Fa" (Five types of eruptive sores) refers to carbuncles and ulcers occurring on the brain, back, shoulders, temples, and beard areas. Generally speaking, they are divided into three grades. The first is Ju (a deep-seated suppurative disease), the second is Yong (a superficial suppurative disease), and the third is Jie (a small acute suppurative lesion).

Ju initially appears as small as a millet seed, with varying sensations of itching and pain. If mistakenly touched and broken, the sore will spread to the surrounding sides, presenting with redness, swelling, heaviness, and stifling sensation, radiating pain to the hypochondrium. After several days, one gradually feels intense heat in the skin and muscles, accompanied by aversion to cold, vexation, thirst, and dizziness. Subsequently, it spreads, exuding serous fluid, failing to ulcerate for many days, and bleeding upon pressure; this is called Back-erupting Ju. Those occurring on the brain are called Brain Ju. Those occurring on the temples, eyebrows, and beard are named accordingly by analogy.

There is another type that initially has no distinct head, with swelling broad and spanning three or four cun. Initially, there is a feeling of stifling pain. After lingering for several days, the skin becomes smooth and soft. In severe cases, it causes fever, aversion to cold, headache, vexation, and thirst; this is called Back-erupting Yong.

There is yet another type that initially presents with a single head, floating red color without a root, swelling visible between the skin layers, measuring one or two cun in size; this is called Jie. Among these three conditions, only Ju is the most severe. The onset of this disease is generally caused by rich dietary flavors and wearing thick, warm clothing. Thick and warm clothing makes the exterior easily susceptible to cold pathogens; excessive consumption of rich foods generates internal heat in the five Zang organs. Accumulated heat in the Zang and Fu organs impedes blood vessel circulation, causing toxic qi to stagnate and evil qi to lurk. Heat combats with blood, leading to blood accumulation, muscle ulceration, and sore formation. Superficial lesions become Jie, substantial manifestations become Yong, and deep-seated ones become Ju.

Some suffer from this disease due to the activation of mineral drugs (Jinshi), while others who never take mineral drugs also suffer from it. This is likely because ancestors once ingested such substances, and their toxicity has been transmitted to descendants. When this disease first appears, if identified as Ju, it should be treated promptly. For individuals with robust Qi, Wuxiang Liaoqiao Tang (Five-Spice Forsythia Decoction) and Loulu Tang (Rhaponticum Decoction) should be taken urgently. For those under fifty years old and physically strong, Wuli Dahuang Tang (Five-Benefits Rhubarb Decoction) and Huadu Wan (Toxin-Dissolving Pill) can be administered to promote bowel movement and organ purification one or two times. Apply Zhuidu San (Toxin-Chasing Powder) to the sore head, followed by warm plaster application. Wash with Gengzhong Tang (More-Swelling Decoction) and Kuaidu Tang (Ulceration-Promoting Decoction). Through such regulation, wait for pus to mature. Prior to this stage, do not use various medicines for forced treatment to avoid unsettling the patient. Be cautious against emotional distress and touching the affected area. Once the pus matures and ulcerates, take Wuxiang Tang (Five-Spice Decoction), along with Neituoli San (Interior-Supporting Powder), Fuling Tang (Poria Decoction), and Danggui Tuoli San (Angelica Interior-Supporting Powder). If thirst persists, take Zhuye Shigao Tang (Bamboo Leaf and Gypsum Decoction) and Ruxiang San (Frankincense Powder). Do not administer bitter-cold purgatives like Dahuang (Rhubarb) and Puxiao (Mirabilite) merely due to high heat. If diarrhea continues uncontrollably after taking purgatives, death may ensue. If foul flesh remains in the sore and pus drainage is poor, immediately apply cauterizing agents or use cautery rods. Apply Luguan San (Deer Horn Powder) mixed with vinegar paste to the upper part. As foul flesh recedes and healthy flesh grows, apply Sonong San (Pus-Searching Powder) and Cuixia San (Emerald Cloud Powder). If toxic qi within the sore is not fully exhausted, do not close the wound prematurely. Avoid applying flesh-generating medicines early; even if temporary recovery occurs, recurrence is inevitable. The sequence of regulation depends on timely appropriateness, focusing mainly on nursing care and contraindications.

Yong and Ju are diseases induced by mineral drugs, frequently occurring in Yang meridians. Thus, on the back, they occur between the Shu points of the Fu organs; on the head, they occur in the brain, because the head is the convergence point of all Yang meridians, and the Foot-Taiyang Bladder Meridian connects to the brain. However, the brain is the Sea of Marrow, where essence and blood gather. The acupoints Naohu (GV17), Fengfu (GV16), and Yamen (GV15) must not be needled or moxed arbitrarily, as this may cause aphonia. Since needling and moxibustion are contraindicated, how much more so for the sites of Yong and Ju? Ancients stated that among the Five Fa diseases, those on the back and brain are critical. Initially appearing as small as a millet seed on the skin, with redness, swelling, side pain in the ears and neck, and alternating chills and fever, urgent treatment is required. Slight delay allows toxic qi to penetrate deeply, melting brain marrow into pus and blood, making it incurable. Hence, the classics state: "One cannot afford to delay the treatment of Yong and Ju." When Ju first appears, a grain-sized lesion like hemp or bean, the body fevers. The flesh at the site becomes red, hot, swollen, elevated, and painful. After rupture, the flesh turns red-purple, indicating external eruption. Even if large as a basin or bowl, rational medication ensures survival.

When Ju first appears, regardless of size, if the body has no fever but feels fatigued, and the site is not hot, expanding over days without swelling, elevation, or pain, becoming depressed and necrotic, turning purple-black upon rupture, this indicates internal eruption. Before manifestation, if the Zang and Fu organs are already necrotic, it is incurable. Additionally, there are Heart Yong, Kidney Yong, Lung Yong, Intestine Yong, and Gujia Ju (Bone-attached Ju) syndromes. Heart Yong arises from heat in the Heart Meridian, often due to alcohol consumption or preference for hot foods, accumulating heat that lingers and steams outward to the skin, impeding Qi and Blood flow. Although dangerous, it is treatable. Use formulas that support the interior and invigorate blood to expel external pathogens. If swelling is elevated and not depressed, safety can be assured. If it sinks inward, reliance is precarious. If appetite is lost, strengthen the Spleen urgently. If appetite returns and the sore ruptures exposing fascia, it is not harmful. Keep it clean, sprinkle flesh-generating powder around the edges, and it will heal naturally.