丹者赤也。如涂赤朱于皮肤之上。亦是热毒蕴蓄恶血于命门相火。合而发起。与痘相兼而生。有
如霞片。浮而薄者易治。浓而紫者难痊。当顺天时。若暑热以通圣辛凉之剂解之。严寒以葛根升麻辛
温之剂解之。痘疮既发。正合其宜。又失于调护。受风热则血沸腾。感寒冷则血凝泣。若沸腾以辛凉
散风之剂。凝泣者以辛温之剂。外亦用涂敷等药治之。如丹从腹往四
肢者生。从四肢入腹者无救。
凡生痘疮。小儿原气壮实则痘易安。有等原气亏虚。或又不曾托表。而又过食甘肥等物。致令胃
中蓄之湿热上入经络。贯于口鼻耳目及牙 上下皆能生疳。津淫日久。湿热生虫。腐蚀牙 。齿脱骨
落。并皆治之。内则益清中除湿热之剂。外以蚕茧子出过蛾的入白矾一撮火 灰共末。上之即愈。
夫小儿痘已出尽。胎毒已化。而又复生痈疽疔毒。是何气使然。答曰。胎毒虽化。气血已亏。再
加于失其调护。致令阴阳相滞。壅塞经络。营气不从。逆于肉里。乃生痈肿疔毒。变生异症。亦皆有
之。何况疮疡乎。枉枉殇夭。不可胜记。轻而变重。重而变危。惜哉。天命耶。失护也。
痘回痂落。宜该清洁。或误食发物。或勤抱风处洗浴。致令复生细疮。如疥非疥。最难得愈。诸
药不
应。惟宜川蜂蜜一二两。用水煎滚。时时呷之。外用怀孕母猪的粪晒干烧灰。不拘多少。再加轻粉五
分。滑石五分末共研细用酒调匀。鹅翎扫搽疮上即愈。
丹毒，是指皮肤呈现红色，如同涂抹了朱砂在皮肤表面一样。这也是因为热毒蕴结、恶血停滞于命门相火之中，两者结合而引发的病症。它常与痘疹同时发生。其形态有的像霞片一样，浮浅而薄的容易治疗，浓重而紫色的难以痊愈。应当顺应天时：若是暑热季节，用通圣散等辛凉性质的方剂来解表清热；若是严寒季节，用葛根升麻汤等辛温性质的方剂来解表散寒。痘疮已经发出时，正适合使用这些方法。如果又失于调养护理，感受风热则血液沸腾，感受寒冷则血液凝滞涩滞。对于血液沸腾的情况，用辛凉散风的方剂治疗；对于血液凝滞的情况，用辛温的方剂治疗。外部也使用涂敷类药物进行治疗。例如，丹毒从腹部向四肢蔓延的预后良好（生），而从四肢向腹部内陷的则无药可救（无救）。
凡是生出痘疮的小儿，如果先天元气壮实，则痘疹容易安稳顺利；有些小儿先天元气亏虚，或者痘疹未能完全托出透发，再加上过食甘甜肥腻的食物，导致胃中蓄积的湿热上侵经络，贯穿到口、鼻、耳、目以及牙齿上下，都能生成疳疾。津液浸淫日久，湿热滋生虫邪，腐蚀牙齿，导致牙齿脱落、牙槽骨萎缩流失。对此类情况，内部服用清中除湿热的方剂，外部用蚕茧（蛾子已破茧而出的）加入一撮白矾，与火灰共同研成细末，外敷患处即可痊愈。
小儿痘疹已经出尽，胎毒已经化解，却又再次生出痈疽疔毒，这是什么原因导致的呢？回答是：虽然胎毒已化，但气血已经亏损，再加上失于调养护理，导致阴阳之气相互阻滞，壅塞经络，营气运行不畅，逆乱于肌肉纹理之间，从而产生痈肿疔毒，变生各种异常病症，这种情况也是存在的。何况是普通的疮疡呢？白白地夭折死亡，不可胜数。轻症转为重症，重症转为危症，可惜啊！这是天命吗？还是因为失于护理呢？
痘疹消退、痂皮脱落后，本应保持清洁。如果误食发物，或者频繁抱着孩子在有风的地方洗浴，导致再次生出细小的疮疡，状如疥疮而非真正的疥疮，最难治愈。各种药物都不见效，只宜用川蜂蜜一两至二两，用水煎煮至沸腾，不时含漱饮用。外用怀孕母猪的粪便晒干烧成灰，不拘多少剂量，再加入轻粉五分、滑石五分，共同研成细末，用酒调匀，用鹅毛笔扫涂在疮面上，即可痊愈。
Dan (Erysipelas) refers to the skin turning red, as if cinnabar were applied to the surface of the skin. This condition also arises from the accumulation of heat-toxin and stagnation of evil blood in the Mingmen (Gate of Life) and Xianghuo (Ministerial Fire), which combine and manifest together. It often occurs concurrently with smallpox. Its appearance may resemble patches of rosy clouds; those that are superficial and thin are easy to treat, while those that are dense and purple are difficult to cure. Treatment should follow the seasonal climate: in summer heat, use acrid-cool formulas such as Tongsheng San (Universal Salvation Powder) to resolve the exterior and clear heat; in severe cold, use acrid-warm formulas such as Gegen Shengma Tang (Pueraria and Cimicifuga Decoction) to resolve the exterior and disperse cold. When smallpox has erupted, these methods are appropriate. However, if care is neglected, exposure to wind-heat causes blood to boil, while exposure to cold causes blood to coagulate and become stagnant. For boiling blood, use acrid-cool formulas to scatter wind; for coagulated blood, use acrid-warm formulas. Externally, topical applications can also be used. For instance, if Dan spreads from the abdomen to the limbs, the prognosis is good (survival); if it spreads from the limbs into the abdomen, there is no hope of rescue (death).
In children who develop smallpox, if their original Qi (Vital Energy) is strong and solid, the eruption will likely proceed smoothly. Some children have deficient original Qi, or their eruptions fail to fully push out to the surface, compounded by excessive consumption of sweet and fatty foods. This leads to damp-heat accumulating in the stomach and ascending into the meridians, penetrating the mouth, nose, ears, eyes, and upper and lower teeth, causing canker sores (Gan disease). Prolonged exudation of fluids allows damp-heat to generate parasites/worms, corroding the teeth, leading to tooth loss and alveolar bone resorption. Internally, administer formulas that clear the middle and remove damp-heat. Externally, use cocoons from which moths have already emerged, mixed with a pinch of alum (Bai Fan) and wood ash, ground into fine powder, and applied to the affected area for immediate healing.
After a child's smallpox has fully erupted and the fetal toxin has been transformed, why do carbuncles, ulcers, and hard boils (Ding Du) reappear? The answer is: although the fetal toxin has been resolved, Qi and Blood are now depleted. Coupled with neglect in care, this leads to stagnation between Yin and Yang, obstruction of the meridians, and failure of Ying Qi (Nutritive Qi) to flow properly, reversing within the muscle tissue. This generates swelling, carbuncles, and hard boils, resulting in various abnormal symptoms. This applies even more so to ordinary sores and ulcers. Many die prematurely in vain. Mild cases become severe, severe cases become critical. Alas! Is it fate, or is it due to lack of care?
After smallpox scabs fall off, cleanliness should be maintained. If one mistakenly consumes "stimulating" foods (Fa Wu) or frequently bathes the child in windy places, fine sores resembling but not being true scabies may reappear, which are extremely difficult to heal. Various medicines prove ineffective. The best remedy is to take 1–2 liang of Sichuan honey, boiled in water until rolling, and sipped occasionally. Externally, dry the feces of a pregnant sow and burn it to ash. Take an unspecified amount, add 5 fen of Calomel (Qing Fen) and 5 fen of Talcum (Hua Shi), grind them together into a fine powder, mix evenly with wine, and apply to the sores using a goose feather brush for immediate healing.