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Heiding (Black Carbuncle) secretly arises in the ear cavity, presenting with a black color and deep roots, resembling the shape of a pepper seed. The pain is like a needle piercing, radiating to the cheek and brain. Upon rupture, it bleeds and discharges fluid, caused by the attack of Fire-Toxin.
[Note] This condition arises in the hidden parts of the ear cavity, triggered by Fire-Toxin in the Kidney Meridian. It may also result from the accumulation of toxins due to the ingestion of hot medicinal substances such as cinnabar and sulfur (Dan-Shi). With a black color and deep roots, resembling a pepper seed, the pain feels like a needle piercing and radiates to the cheek and brain. Upon rupture, blood and fluid are discharged. One should urgently administer Chansu Wan (Toad Venom Pill) to induce sweating. Then, mix Chansu Wan with water to form a thick solution and drip it into the ear cavity for immediate effect. For severe toxicity, use Huanglian Xiaodu Yin (Coptis Decoction for Disinfecting Toxins) to relieve and resolve, and Huanglian Jiedu Tang (Coptis Decoction for Clearing Heat and Resolving Toxins) to clear heat; recovery will follow.

Huanglian Jiedu Tang (Coptis Decoction for Clearing Heat and Resolving Toxins)
Huanglian (Coptidis Rhizoma), Huangqin (Scutellariae Radix), Huangbai (Phellodendri Cortex), Sheng Zhizi (Gardeniae Fructus, crushed, each 1.5 qian).
Decoct in water and take warm.
[Prescription Verse] Huanglian Jiedu treats painful sores, various Ding-toxins causing irritability and madness. Huanglian, Huangqin, Huangbai, and Sheng Zhizi: decoct these four ingredients to ensure safety and health.
Chansu Wan (See Ding Chuang Section)
Huanglian Xiaodu Yin (See Baihui Ju of Head Section)

Er Gang (Ear Fungus/Carbuncle) frequently discharges black, foul-smelling pus. Qing Zhen Er (Green Shock Ear), Bai Chan Er (White Entangling Ear), and Huang Er (Yellow Ear) are formed by the combination of Stomach Dampness and Liver Meridian Fire, Wind Pathogens favoring Liver Blood Heat, respectively.
[Note] This condition involves stuffiness, swelling, and pus discharge in the ear. Due to the different colors of the pus, the names vary. Black, foul-smelling pus is named Er Gang; green pus is named Qing Zhen Er; white pus is named Bai Chan Er; yellow pus is named Huang Er. All are caused by the combination of Stomach Dampness and Liver Fire. Chaihu Qinggan Tang (Bupleurum Decoction to Clear the Liver) is indicated. For cases with excess Qi and vigorous Fire, Longdan Xiegan Tang (Gentian Decoction to Drain the Liver) should be taken. Only Feng Er (Wind Ear) discharges red pus, which leans towards Liver Meridian Blood Heat; Siwu Tang (Four Substances Decoction) added with Mudanpi (Moutan Cortex) and Shichangpu (Acori Tatarinowii Rhizoma) is indicated. Externally, natural oil extracted from pickled eggplants should be dripped into the ear. Once the pus is cleared, switch to Er You (Ear Oil), dripping it occasionally until the swelling subsides and flesh regenerates, leading to self-healing.

Di Er You (Ear-Dripping Oil)
Crush Walnut Ren (Juglandis Semen), press out the oil, remove dregs, obtain 1 qian of oil, and mix with 2 fen of Bingpian (Borneolum Syntheticum). Use a small amount each time, drip into the ear.
[Prescription Verse] Di Er You treats Er Gang syndrome; dripping after pus clearance yields deeper efficacy. Walnut oil reduces swelling and relieves pain; Borneol disperses heat and clears the spirit.
Chaihu Qinggan Tang (See Binju of Head Section)
Longdan Xiegan Tang (See Chanyao Huodan of Waist Section)
Siwu Tang (See Kaihuang Section)