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Hand Back Carbuncle (Shoubai Fa)
This ulcer occurs at the Zhongzhu (TE5) and Yemen (TE2) acupoints on the back of the hand. It belongs to the Hand Shaoyang Sanjiao Meridian (Triple Burner), which is characterized by abundant Qi and scarce Blood. In its early stage, it causes aversion to cold accompanied by fever, or may present with vomiting, itching, and pain.
The prognosis involves "Five Auspicious Signs" (Wu Shan) and "Seven Inauspicious Signs" (Qi E). Detailed treatment should be conducted according to the discussions in relevant chapters.

Foot Back Carbuncle (Zubei Fa)
This ulcer occurs on the dorsum of the foot, specifically at the Hengyang (ST43) and Xian Gu (ST41) acupoints. It belongs to the Foot Yangming Stomach Meridian, which is characterized by abundant Blood and abundant Qi. In its initial onset, it causes fever and vomiting, along with pain, itching, or numbness. Treatment should follow the previous chapter's guidelines, utilizing moxibustion or methods to support the body's resistance and expel toxins (Tuo Zhi). A stable condition indicates a favorable outcome.

Kidney Yin Carbuncle (Shenyin Fa)
This ulcer occurs in the scrotum. Also known as Xuan Yong (Hanging Abscess) or Nang Yong (Scrotal Abscess). It is located where the Chong Mai (Penetrating Vessel) and Ren Mai (Conception Vessel) intersect. The term "Fa" (Carbuncle/Eruption) implies that the swelling is large, even larger than a typical abscess. Furthermore, the scrotum is essentially a hollow sac; when Qi and Blood condense there, it can cause significant swelling. There are cases where even if the scrotal tissue rots away completely, leaving only the testicles, the patient may survive; there are also cases where total ulceration and shedding occur without death.

Opposite Umbilicus Carbuncle (Duiqi Fa)
This ulcer occurs at the Mingmen (GV4) acupoint on the lower back, opposite the umbilicus, hence the name. It belongs to the Du Mai (Governing Vessel). If the pathogenic toxin erupts causing severe pain, survival is possible if yellowish-white, thick pus is expressed upon incision. However, if blood-tinged fluid or clear, thin fluid drains out, accompanied by mental confusion, hallucinations (seeing ghosts) during sleep, delirious speech, and extreme thirst, death is likely. Patients who practice proper self-care and avoid taboos may still survive.

Ai Fa (Cancerous Eruption)
This ulcer occurs at the Shendao (GV11) and Lingtai (GV10) acupoints. It involves the Du Mai (Governing Vessel) and the Bladder Meridian. This area is characterized by abundant Blood and scarce Qi. In its early stage, there is no aversion to cold, fever, pain, or tenderness. The skin appears purple-black and does not rupture, while the internal tissue first undergoes necrosis and blackening. In individuals over twenty years old, this condition arises from improper sexual conduct leading to accumulated heat. In individuals over forty, it results from deficiency of Blood and decline of Qi, combined with excessive consumption of rich and heavy foods. Only one or two out of ten patients recover. Cases presenting with blackened skin are difficult to treat and invariably fatal.