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[Prescription Verse] Sheyan Ding (Snake-Eye Carbuncle) arises beside the nail, while that behind the nail is named Shebei Ding (Snake-Back Carbuncle); Zhujie Ding (Woodworm-Joint Carbuncle) occurs at the middle phalanx bone, and Shefu Ding (Snake-Belly Carbuncle) presents with a fish-belly swelling on the palmar side of the finger. Niqiu Ju (Loach Ulcer) involves diffuse swelling of the entire finger, with heat, inflammation, and pain radiating to the elbow and arm. One must identify the meridian based on the affected finger; ultimately, these conditions are caused by Fire-Toxin accumulating in the Zang-Fu organs.
[Annotation] There are five types of this condition: For instance, Sheyan Ding arises on both sides of the nail, resembling a bean in size, with a purple color, partially exposed, and hard like an iron nail; Shebei Ding arises behind the nail root, shaped like half a jujube, with redness and swelling; Zhujie Ding, also known as Shejie Ding, occurs at the middle joint, causing circumferential swelling of the finger, with colors varying from yellow to purple; Shefu Ding, also known as Yudu Ding, appears on the anterior aspect of the middle finger joint, swelling like a fish belly, with redness and pain; Niqiu Ju presents with uniform swelling of one finger, purple in color, shaped like a loach, accompanied by burning heat and pain radiating to the elbow and arm. In the initial stage, it is appropriate to administer Chansu Wan (Toad Venom Pill) to induce sweating, apply Xionghuang San (Realgar Powder) externally, followed by taking Xianfang Huoming Yin (Immortal Recipe for Saving Lives Decoction). Once pus matures, incise and drain, then apply Hupo Gao (Amber Ointment) to promote pus formation and tissue regeneration; for those with deficiency unable to close the wound, tonify them. However, all five conditions essentially result from the coagulation of Fire-Toxin. Regarding which meridian or Zang-Fu organ is involved, differentiation is made clinically by observing which finger is affected. The meridians of the fingers are detailed in the annotations of the first volume.
Formulas: Chansu Wan (see section on Ding Chuang/Carbuncles), Xionghuang San (see section on Shetou Ding/Snake-Head Carbuncle), Xianfang Huoming Yin (see section on Zhongyang/Ulcers), Hupo Gao (see section on Head Scalp Sores).

[Prescription Verse] Daizhi (Subungual Abscess) typically occurs within the nail bed, initially presenting with swelling, burning heat, and pain severe enough to reach the heart. Mild cases may ulcerate with slight pus discharge, while severe cases result in nail shedding. The etiology is Blood-Heat in the meridians.
[Annotation] This condition arises within the fingernail, caused by the coagulation of Blood-Heat in the meridians. Initially, there is swelling and burning heat, with pain radiating to the heart. It is suitable to use Gancao (Licorice Root) and Puxiao (Mirabilite) each 5 qian, boiled in water for soaking and washing, which will lead to recovery. If pain persists, after three to four days, a small yellowish-white spot may appear on the dorsal surface of the nail, indicating that internal pus has formed but lacks an exit. Urgently use a thread needle to prick a small hole near the pus on the nail plate to allow drainage, then squeeze out residual pus, and apply Huanglian Gao (Coptis Ointment) for easy healing. Alternatively, if treatment is neglected or cold-natured medicines are over-applied, leading to cold coagulation of muscles and erosion of healthy tissue by pus-toxin, the nail will become hollow and inevitably shed. In such cases, apply Hupo Gao (Amber Ointment), and recovery will occur within one to two months.
Formulas: Huanglian Gao (see section on Nasal Sores), Hupo Gao (see section on Head Scalp Sores).