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Zhou Wencai stated: Initially, it appears like a grain of rice, gradually enlarging with a root. When the head breaks, blood flows and pus is discharged, and the flesh resembles an open flower; hence it is named Fan Hua Chuang (Flower-Reversal Sore) (from *Ji Yan Fang*).

Chen Shigong stated: This sore has a large head and a small stalk; the small ones are like beans, and the large ones like mushrooms. It causes no pain or distress, but rubbing the damaged area causes fresh blood to flow. Over time, it debilitates the person. The general treatment principle is to mix Bing Si San (Ice Snail Powder, a caustic external preparation) with saliva and rub it evenly over the front surface of the sore. Cover externally with soft oiled paper. At the narrow base, tie tightly with thread along with the paper. After ten days, the affected tissue will naturally fall off, then switch to applying Zhen Zhu San (Pearl Powder) to promote healing and close the wound (from *Wai Ke Zheng Zong*).

Dou Hanqing stated: Ya Dan Chuang (Crow-Bitten Sore) results from long-term accumulation of pathogenic heat, leading to deficiency-cold in the zang-fu organs, depletion of qi and blood, and loose cou li (skin texture and pores). It manifests on the skin, initially resembling coin holes, later ulcerating with a shape similar to crow-pecked marks. If neglected for a long time, the damage becomes difficult to treat. Use Ya Dan San (Crow-Bitten Powder) (from *Yi Zong Bi Du* or related comprehensive texts).

Ya Dan San (Dou's Formula):
Lao Ya Mao (Old Crow Feather, burnt to ash), Da Hong Rong (Big Red Velvet/Fabric, burnt to ash), Huang Dan (Lead Monoxide, each 1 qian), Zhen Zhu (Pearl, 5 fen), Bing Pian (Borneol, 1 fen), She Xiang (Musk, a small amount), Qing Fen (Calomel, 3 fen), Ku Fan (Alum, calcined, 5 fen).
Grind all into a fine powder. First wash the affected area with bitter tea, then apply the dry powder directly.

For sores on the face:
Hu Fen (White Lead), Qing Fen (Calomel), Song Xiang (Pine Rosin) (equal parts).
Grind finely. Mix with oil fried from egg yolks and rub onto the area.

For toxic malignant sores with heat-toxin on the face (Feng's Formula):
Hu Fen (White Lead), Huang Bo (Phellodendri Cortex, stir-baked), Huang Lian (Coptidis Rhizome) (equal parts).
Grind finely. Mix with lard and apply as a poultice.

For early-stage toxic sores on the face (Secret Recipe of Ling Huangzhang):
Hastily find one or two Shui Yan You (Leeches), mash them together with a little sauce, spread the mixture on paper, leave a small hole for ventilation, and paste it on the lesion.

Shen Douyuan stated: Huang Shui Chuang (Yellow Water Sore) is also known as Di Nong Chuang (Dripping Pus Sore) (from *Qi Xuan Zhi Zhang*).

Chen Shigong stated: Yellow blisters suddenly appear on the head, face, ears, neck, and sides, bursting to discharge serous fluid, spreading rapidly within moments, often accompanied by pain and itching. This is caused by sun exposure and wind blowing, sudden contraction of damp-heat pathogens, or internal consumption of damp-heat-inducing foods, leading to wind stirring and fire generating. Treat using Ge Fen San (Clam Powder) or Si Wei Yi Gong San (Four-Ingredient Extraordinary Efficacy Powder) applied topically (from *Wai Ke Zheng Zong*).

Feng Luzhan stated: Sores appearing on the face and around the ears, discharging yellow water intermittently, spreading and failing to heal for a long time, are named Xiang Ban Chuang (Fragrant Petal Sore) (from *Wai Ke Jin Nang*).

Whenever tiny sores arise initially, they break easily upon slight touch. Wherever the toxic fluid flows, large blister-like sores emerge, which constitutes Huang Shui Chuang (Yellow Water Sore). This is due to heat-toxin stagnating in the skin and hair follicles. It should be washed with decoctions (from *Wai Ke Mi Lu*).