胡公弼曰∶肘后毒乃风毒流走，气血凝滞，脉通五指，结成肘毒。（《青囊》）
《心法》曰∶肘痈生于肘之围绕，由心肺风火凝结而成。形小为疖，形大为痈。
申斗垣∶鱼脐疮形似鱼脐，生于肘肚者，是手少阴心经多气少血，少海、灵
道上是也。生于小腿肚者，是足少阳膀胱经多血少气，承山、飞扬二穴上下是也。（《启玄》）
王肯堂曰∶腕痈生于手屈之处，俗名手牛押屈，此手三阴经风热聚毒之所致也。（《准绳》）
李东垣曰∶腕痈生于手腕背，而属手三阳，由风火凝结而成，乃皮肉浇薄之处。
若迁延日久不溃，或漫肿平塌，既溃，腐烂露骨者逆，难于收功。
\r腕痈\p04-a41a113.bmp\r
\r兑疽\p04-a41a114.bmp\r
陈实功曰∶兑疽生于手之动脉处，肿痛寒热，痛彻手膊，举动不便者是。
朱丹溪曰∶兑疽生手腕里面横纹后，前稍动脉之间，左右同，乃肺经门户。若发
疽或溃深，则肺气大泄，最为险候。
王肯堂曰∶ 疮生于手足间，相对如新茱萸，痒痛折裂搔破，则黄水淋漓，有
孔如 ，久而生虫。（《准绳》）
《心法》曰∶ 疮生于指掌之中，形似茱萸，两手相对而生，亦有成攒者。初起
黄白脓泡，痒痛无时，破流黄汁，时好时发，极其疲顽。由风湿客于肤腠而成。宜
以润肌膏搽之。若日久，内必生虫，用藜芦膏擦之。兼戒口味。
胡公弼说：肘后毒是风毒流窜，导致气血凝滞，脉气通达五指，从而结成肘部的毒疮。（出自《青囊》）
《医宗心法》说：肘痈生长在肘部周围，由心肺的风火凝结而成。形状小的称为疖，形状大的称为痈。
申斗垣说：鱼脐疮形状像鱼肚脐，生长在肘窝（肘部弯曲处的肉厚部分）的，属于手少阴心经，该经多气少血，穴位在少海、灵道等部位。生长在小腿肚的，属于足太阳膀胱经，该经多血少气，穴位在承山、飞扬两穴上下。（出自《启玄》）
王肯堂说：腕痈生长在手腕弯曲处，俗称“手牛押屈”，这是手三阴经的风热聚集成毒所致。（出自《准绳》）
李东垣说：腕痈生长在手背手腕处，归属于手三阳经，由风火凝结而成，这里是皮肉较薄的地方。如果拖延日久不溃破，或者漫肿平塌，一旦溃破，腐烂露出骨头的，属于逆证，难以治愈收功。
陈实功说：兑疽生长在手的动脉处，表现为肿痛、寒热，疼痛放射至手臂，活动不便的就是这种病。
朱丹溪说：兑疽生长在手内侧腕横纹后方、稍前方的动脉之间，左右手相同，这里是肺经的门户。如果发生疽或溃烂较深，会导致肺气大量泄脱，是最为危险的证候。
王肯堂说：茱萸疮生长在手足之间，相对而生像新的茱萸果实，瘙痒疼痛，抓破后有黄水淋漓，有孔洞如虫蚀状，日久会生虫。（出自《准绳》）
《医宗心法》说：茱萸疮生长在手指和手掌中间，形状像茱萸，两手相对而生，也有成簇生长的。初起时有黄白色的脓泡，随时感到瘙痒疼痛，破溃后流出黄色汁液，时好时发，极其顽固难愈。这是由于风湿之邪客居皮肤腠理所致。适宜用润肌膏涂抹。如果日久，内部必然生虫，可用藜芦膏擦拭。同时需忌口。
Hu Gongbi stated: Zhouhou Du (Elbow Posterior Toxicity) is caused by the wandering of wind-toxin, leading to stagnation of Qi and Blood. The pulse meridians extend to the five fingers, resulting in the formation of a toxic sore at the elbow. (From *Qingnang*)
*Yizong Xinfa* (Medical Master's Heart Methods) states: Zhou Yong (Elbow Abscess) arises around the elbow, formed by the coagulation of Wind-Fire from the Heart and Lungs. When small in form, it is called Jie (Furuncle); when large, it is called Yong (Abscess).
Shen Douyuan stated: Yuqi Chuang (Fish-Belly Ulcer) resembles a fish's navel. Those occurring in the cubital fossa (the fleshy part of the elbow bend) belong to the Hand-Shaoyin Heart Meridian, which is abundant in Qi but deficient in Blood; the acupoints involved are Shaohai and Lingdao. Those occurring in the calf belong to the Foot-Taiyang Bladder Meridian, which is abundant in Blood but deficient in Qi; the area involves the upper and lower regions of Chengshan and Feiyang. (From *Qixuan*)
Wang Kentang stated: Wan Yong (Wrist Abscess) occurs at the flexion point of the wrist, commonly known as "Shou Niu Ya Qu." This is caused by the accumulation of Wind-Heat and Toxin in the Three Yin Meridians of the Hand. (From *Zhunsheng*)
Li Dongyuan stated: Wan Yong occurs on the dorsal aspect of the wrist, belonging to the Three Yang Meridians of the Hand. It is formed by the coagulation of Wind-Fire and occurs in areas where the skin and flesh are thin. If it persists for a long time without ulcerating, or presents with diffuse swelling and flat collapse, and upon ulceration reveals exposed bone with rotting tissue, it is considered a Ni Syndrome (Adverse/Intractable condition), making recovery difficult.
Chen Shigong stated: Dui Ju (Dui Carbuncle) occurs at the arterial site of the hand, characterized by swelling, pain, chills, and fever, with pain radiating to the arm and difficulty in movement.
Zhu Danxi stated: Dui Ju occurs behind the transverse crease of the wrist on the palmar side, between the slightly anterior arteries. It appears on both hands and represents the gateway of the Lung Meridian. If a Ju develops or ulcerates deeply, it causes massive leakage of Lung Qi, representing a most critical and dangerous syndrome.
Wang Kentang stated: Zhuyu Chuang (Cornel Fruit Ulcer) occurs between the hands and feet, growing oppositely like fresh cornel fruits. It is itchy and painful; scratching breaks the skin, causing copious yellow discharge. It forms holes resembling insect bites and, over time, generates worms. (From *Zhunsheng*)
*Yizong Xinfa* states: Zhuyu Chuang occurs between the fingers and palms, resembling cornel fruits, growing oppositely on both hands, sometimes in clusters. Initially, yellow-white pustules appear, accompanied by intermittent itching and pain. Upon rupture, yellow fluid flows out; the condition fluctuates between remission and exacerbation, proving extremely stubborn and chronic. It is caused by Wind-Dampness invading the skin and interstices. It is suitable to apply Runji Gao (Moisturizing Muscle Ointment). If the condition persists for a long time, worms will inevitably generate inside; Lili Gao (Veratrum Ointment) should be applied. Dietary restrictions must also be observed.