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Cui Shi's Formula for Onychia (Nail Fungus/Paronychia): The disease known as onychia may arise from cutting the nail and injuring the flesh, or from the nail growing too long and invading the flesh to form a sore with swelling and pain. It may also be caused by narrow boots rubbing and damaging the sides, leading to swelling and the discharge of yellow fluid. This exudate spreads and infects, causing all five fingers to rot, gradually extending upward to the ankle. Blisters filled with pus rise around the area like a burn, worsening day and night. This is a condition that ten thousand physicians cannot cure.

Five liang of Vitriol (Lüfan Shi), which resembles Glauber's salt in shape and color but is green.
Take the above single ingredient, place it on an iron plate, seal it with charcoal, and use a bag to bellows air until the fire is intense and it boils. When the liquid flows out, red like molten gold, observe until boiling stops and the juice is exhausted. Remove from fire. If following this method is ineffective, it can serve as an emergency remedy for onychia.

Purslane growing on roofs (Wushang Machicai), Kunlun Qingmu Xiang (Aucklandia Root), and Yin Cheng Yan (Processed Salt).
Burn the above three ingredients into ash separately, take equal parts, and mix with a small amount of Cinnabar (Guangming Sha). Blend thoroughly and sieve into a fine powder. Apply to the sore; change when dry. Continue until healed. Before the sore is fully healed, avoid consuming chicken, pork, fish, meat, pungent/spoiled foods, alcohol, garlic, etc. After healing, continue to abstain from alcohol for thirty days for good results. (From Volume 9)

Bixiao Formula for Onychia: A formula for cases where red flesh grows on the edge of the nail, wrapping around it.
Take alum from Guazhou, heat until boiling, let it set, grind into powder, and apply. If it becomes wet, scrape it off and reapply. Change several times a day, and it will dissipate. Dou Xuancheng Chuo stated it is effective. It also treats miscellaneous sores with insects and yellow fluid. Using Baiyan Shi (White Alum) from Wu region is also good. If unavailable, Jishi Fan (Chicken Manure Alum) is also acceptable.

Another formula for treating onychia sores with swelling, rotting, and polyp growth, where red flesh protrudes from the side of the toe nail, recurring intermittently.
Huanglian (Coptis Rhizome) (two liang), Ganjiang (Dried Ginger) (three liang).
Chop the above two ingredients, soak in vinegar (Ku Jiu) overnight. Decoct with five he of lard over low heat until reduced to two he. Strain to remove dregs. Apply to the sore three to four times daily; the polyps will dissipate. (From Volume 4)

Jin Xiao Formula: A miraculous formula for treating onychia sores.
Xunhuang (Realgar), Shepi (Snake Skin, burnt to ash).
Mix equal parts of the above two ingredients and grind together. First, soak and wash the sore with warm rice water until soft. Use a sharp knife to cut away the ingrown nail corner. Dry the area. Take a dose the size of a date or chestnut, apply to the sore, and wrap with soft cotton. Change the dressing when the medicine becomes wet after about half a day. The condition should be permanently resolved within one day. For those who experienced pain beforehand, the pain should subside after about one meal's time following application. After healing, do not wear tight boots or shoes for one or two days. If one can also abstain from alcohol and consume no pork, chicken, fish, garlic, or wheat products, the effect will be more lasting. The medicine need only be used three or four times to achieve a permanent cure. (Effective according to Physician Xiao Shisi Langzhong)