夫瘦人多火，多血虚，血虚即阴虚，阴虚则火盛，火盛则发热，筋骨瘦而不胜于
寒，盖皮宽肉缓，如生疮疡则多疽。疽者，沮也。属阴，因荣血受邪，凝注不从，正
是阴滞于阳，血滞于气，则为疽也。又云∶疽乃五脏之毒，痈为六腑之毒，故疽多附
于骨，肉色不变，故难于溃，溃而难敛，治宜八珍汤中加金银花、连翘、附子之类加减治之。
婴孩之辈，乃气血未充，筋骨未坚，脾胃尚脆，凡有痈疽，多是胎毒，或母不慎
调护，致令血气壅滞，多生疮肿，只宜内托内疏汤剂，和缓之药，不可用大猛峻之
剂，有伤胃气。外有无辜疳毒，不同大人治法，只宜消疳大补之剂即安。
澄曰∶婴孩皮肉娇嫩，不可轻用白降丹，不但疼痛难经，且易 肿吓人。
又曰∶小儿疮毒，切勿妄用水银、轻粉、硫黄，收敛毒瓦斯，每致杀人。
或问小儿痘已出尽，胎毒已化，复生疮疽疔毒，是何气使然？答曰∶胎毒虽化，
气血已亏，皆由失于调护，致令阴阳壅塞经络，营气不从，逆于肉里，乃生痈肿疔
毒，变生异证，亦皆有之，何况疮疡乎？故痘后不可不慎调护也。
澄曰∶每见小儿痘后，月余忽发痈疽，咸谓痘浆不足，余毒为害；殊不知痘后气
血未复，脾胃失调所致，若妄用败毒清凉之品，内服外敷，则鲜有不危者。必须培
补气血，扶脾内托，可消自消，即溃亦易于敛口。
瘦人（身体消瘦者）体内多火，且常伴有血虚；血虚即为阴虚，阴虚则导致虚火亢盛，虚火亢盛则引起发热。由于筋骨消瘦而不能抵御寒冷，加之皮肤松弛、肌肉薄弱，一旦生疮疡，多为疽病。所谓“疽”，意为阻滞不通。它属于阴证，是因为营血受邪气侵袭，凝滞不行，正气与邪气相搏，实际上是阴邪阻滞于阳分，血液瘀滞于气分，从而形成疽病。又有说法称：疽是五脏的毒邪所致，痈是六腑的毒邪所致。因此，疽多附着于骨骼，表面皮色不变，所以难以溃破，即使溃破也难以愈合。治疗适宜在八珍汤中加入金银花、连翘、附子等药物进行加减化裁。
婴幼儿气血尚未充盈，筋骨尚未坚固，脾胃功能尚脆弱。凡是发生痈疽，大多源于胎毒，或者是母亲在孕期调护不慎，导致气血壅滞，从而容易生疮肿。对此只宜使用内托内疏汤等和缓的药物进行治疗，不可使用过于猛烈峻急的药剂，以免损伤胃气。此外，小儿特有的无辜疳毒，治疗方法不同于成人，只需使用消疳大补的药剂即可痊愈。顾世澄说：婴幼儿皮肤娇嫩，不可轻易使用白降丹，不仅疼痛难忍，而且容易引起严重肿胀，令人惊恐。他又说：对于小儿的疮毒，切勿胡乱使用水银、轻粉、硫黄等药物，这些药物会收敛毒气，往往导致死亡。
有人问：小儿痘疹已经出尽，胎毒已经化解，却又生出疮疽疔毒，这是什么原因造成的？回答说：虽然胎毒已化，但气血已经亏损，这都是因为失于调护，导致阴阳之气壅塞经络，营气运行不畅，逆乱于肌肉腠理之间，从而产生痈肿疔毒，甚至变生各种异常病症，更何况是普通的疮疡呢？所以痘疹之后必须谨慎调护。顾世澄说：经常见到小儿在出痘后一个多月突然发作痈疽，大家都认为是痘浆不足、余毒为害；却不知道这是因为痘后气血尚未恢复，脾胃功能失调所致。如果妄用败毒清凉的药物，无论是内服还是外敷，很少有不被危及生命的。必须采用培补气血、扶助脾胃并配合内托法的治疗，这样轻微的病灶可自行消散，即使溃破也易于收口愈合。
Emaciated individuals (those with thin constitutions) tend to have excessive fire and blood deficiency; blood deficiency constitutes yin deficiency, which leads to hyperactive fire, and hyperactive fire causes fever. Due to emaciated sinews and bones that cannot withstand cold, combined with loose skin and weak flesh, if sores and ulcers occur, they are mostly *ju* (deep-seated abscesses). The term "ju" implies obstruction. It belongs to the yin category, caused by nutritive blood being affected by pathogens, leading to stagnation and failure to circulate smoothly. This is essentially yin stagnation obstructing yang, and blood stagnation obstructing qi, resulting in *ju*. Another view states: *ju* is the toxicity of the five zang organs, while *yong* (superficial abscesses) is the toxicity of the six fu organs. Therefore, *ju* often attaches to the bones, with unchanged skin color, making it difficult to suppurate; even after suppuration, it is difficult to heal. Treatment should preferably involve modifying Bazhen Tang (Eight Treasures Decoction) by adding Honeysuckle Flower (Jinyinhua), Forsythia Fruit (Lianqiao), Aconite Root (Fuzi), etc.
Infants and young children have unfulfilled qi and blood, undeveloped sinews and bones, and fragile spleen and stomach functions. Any occurrence of *yong* or *ju* is mostly due to fetal toxin, or improper care by the mother during pregnancy, causing qi and blood stagnation, which easily leads to sores and swellings. Treatment should only employ mild formulas such as Neituo Neishu Tang (Internal Support and Internal Dispersal Decoction); harsh and potent agents must be avoided to prevent damaging stomach qi. Additionally, innocent glandular phlegm-toxin (Wugu Gandu) in children differs from adult treatment methods; it can be cured simply with tonifying and eliminating phlegm-toxin formulas. Gu Shicheng stated: Infants' skin and flesh are delicate; Baijiang Dan (White Reduction Pill) should not be used lightly, as it causes unbearable pain and severe swelling that is frightening. He also said: For pediatric sores and toxins, mercury (Shuiyin), calomel (Qingfen), and sulfur (Liuhuang) must never be used recklessly, as they astringe toxic vapors and often lead to death.
One asked: After a child's smallpox has fully erupted and the fetal toxin has transformed, why do sores, *ju*, carbuncles, and *ding* (hard boils) reappear? The answer is: Although the fetal toxin has transformed, qi and blood are already depleted. This results from neglect in care, causing yin and yang to become obstructed in the meridians, and nutritive qi failing to follow its proper course, reversing within the muscle tissue, thereby generating *yong*, swellings, *ding*, and toxins, and even producing abnormal manifestations, let alone ordinary sores and ulcers. Therefore, careful nursing is essential after smallpox. Gu Shicheng stated: I often see children developing *yong* or *ju* more than a month after smallpox. Everyone attributes this to insufficient pus from the smallpox and residual toxicity harming the body; however, they fail to realize that this is caused by unrestored qi and blood and dysfunctional spleen and stomach after smallpox. If one recklessly uses detoxifying and cooling agents for internal administration or external application, few will avoid critical danger. One must cultivate and tonify qi and blood, support the spleen, and employ internal support methods. Mild lesions will resolve spontaneously, and even if they suppurate, they will heal easily.