劳苦之辈，腿足多有粗筋盘曲，则筋内即血管或湿气盛，与血分过热者，虽发外疡，
误用刀针，恐血淌不止无救。
燕窝是海燕衔小鱼粘于石上而成，藉燕口含之元气，清补肺阴。乃海味发物，若外
症误食，补塞毛孔，毒遂内陷不出，串肿溃烂不可收拾也。
肺司皮毛，脾主肌肉，二脏虚损，湿邪留连，化热下注，热甚则皮赤而发热，湿甚
则肿胖而恶寒，多在盛夏，阳气发扬，湿暑流布，生于虚体安逸之辈，而足胫先肿而后
痛，是血伤气，名湿香港脚。或先足弯一点红肿，或自足指与足胫先起，而后串肿一腿，或
串及两腿胫者，七日可退。若香港脚上冲，乃水来凌火，则呕吐不止，喘急不休者逆也。以
当归拈痛汤。（方见后。）
足胫不肿而痛，蜷缩枯细，乃热甚伤血，为干香港脚，宜凉血清燥汤。（方见后。）
外症脱腐之时，脓血去多，正气难支，患底肉如灰色，全无生气。或患上骤变，干枯
无脓，四边皮色， 红起晕，锁住患口。或针刺刀割，并不知痛，口渴唇燥，心神慌张，
形色呆板，脉象弦硬。皆胃气败绝，血枯肉死，无根浮火外泄，阴阳两离，殆四五日之
命。
脾肾两亏，加之劳力过度，损伤筋骨，使腰胯隐痛，恶寒发热，食少形瘦。背脊骨中凸肿如梅，初
不在意，渐至背伛颈缩。盖肾衰则骨痿，脾损则肉削，其龟背痰已成，愈者甚寡，纵保得命，
遂为废人。宜久服补肾汤。（方见后。）
Individuals engaged in hard labor often have thick, coiled tendons in their legs and feet, indicating either full blood vessels within the tendons or excessive dampness. In cases where there is excessive heat in the blood level, even if external sores appear, mistakenly using knives or needles may cause uncontrollable bleeding that is incurable.
Swallow's nest (Yanwo) is formed by swiftlets attaching small fish to rocks, utilizing the vital qi contained in the swallow's mouth to clear and tonify Lung Yin. However, it is a "fa wu" (food that can trigger or exacerbate diseases) among seafood. If mistakenly consumed during external conditions, it can block pores, causing toxins to sink inward and not exit, leading to spreading swelling and unmanageable ulceration.
The Lung governs the skin and hair, while the Spleen governs the muscles. When these two organs are deficient, damp pathogens linger, transform into heat, and flow downward. Severe heat causes red skin and fever; severe dampness causes swelling, obesity, and aversion to cold. This mostly occurs in midsummer when yang qi expands and damp-heat spreads, affecting those with weak constitutions who lead sedentary lives. Symptoms include swelling followed by pain in the lower legs, known as "Damp Hong Kong Jiao" (Hong Kong Foot caused by damp-heat), representing blood injury affecting qi. Alternatively, it may start with slight redness and swelling at the popliteal fossa, or begin at the toes and lower legs, then spread to swell the entire leg or both lower legs; such cases can resolve within seven days. If the pathogen of Hong Kong Foot rushes upward, it indicates Water insulting Fire, manifesting as incessant vomiting and relentless panting, which is a adverse prognosis. Treatment should employ Danggui Niangong Tang (Angelica Ligusticum Chuanxiong Decoction). (Formula see later.)
If the lower legs and shins do not swell but hurt, with curling up and wasting/thinning, it is due to severe heat injuring the blood, known as "Dry Hong Kong Jiao" (Dry Hong Kong Foot), suitable for Liangqing Xengzao Tang (Cool Blood Dryness-Resolving Decoction). (Formula see later.)
During the shedding of necrotic tissue from external sores, if too much pus and blood are lost, righteous qi struggles to support. The base flesh of the lesion appears gray with no vitality. Or sudden changes occur: dryness without pus, surrounding skin turning red with halos, locking the wound opening. Puncture or cutting yields no pain; thirst and dry lips ensue; the mind is panicked; expression is dull; pulse is wiry and hard. These all indicate failure of Stomach Qi, exhaustion of blood, death of flesh, leakage of rootless floating fire, separation of Yin and Yang, with only four to five days of life remaining.
Deficiency of both Spleen and Kidney, compounded by overexertion damaging sinews and bones, causes dull pain in the waist and hips, aversion to cold, fever, poor appetite, and emaciation. A plum-sized protrusion/swelling appears in the spine; initially ignored, it gradually leads to kyphosis (hunchback) and neck retraction. Since Kidney decline causes bone flaccidity and Spleen damage causes muscle wasting, Guibei Tan (Tortoise Back Phlegm) has formed. Few recover; even if life is saved, the patient becomes disabled. Long-term administration of Bushen Tang (Kidney-Tonifying Decoction) is appropriate. (Formula see later.)