痘后发痈疖者，乃痘毒之气留于经络未尽去，故壅于肢筋间而发者也。亦有既平之后失于
解利而生。惟小柴胡汤加生地黄最妙，或清凉欲子、大连翘饮、消毒饮、犀角地黄汤皆可。
痘疮既平，余热不除者，当量其轻重而治之。大热则利小便，小热则宜解毒。盖利小水
使心有所导引，虽不用凉药而其余热自无容留矣。小热解毒者，盖小热不解，大热必生。利用
导赤散，解用犀角地黄汤，切不可峻下。痘后胃气一虚，而反变生痈肿别病。若身热血他证者，
用六味柴胡麦门散。咽喉口舌生疮不能吮乳者，用如圣麦门冬汤。
痘疮观其形证，则知轻重。轻者不必服药，重者宁不早图而救治乎？凡痘疮已出未出，大
便秘，小便赤涩，
发热口渴，为里热。可用凉血解毒、润便利水消毒饮、四圣散之类。凡先后吐泻不食初见，须
速调之。若稍延缓，致令元气虚惫，必致难救。其有实证轻顺，俱不必服保元汤诸补药。若里
实而用补剂后，必结痈余毒；表实而用补剂，则必斑烂溃痛。
作三四次出，头目胸腹稀少，眼中无，大小不等，肥满光泽，里外肥红，根脚红，头
腊色。
一齐并出，密如蚕种，身温腹胀，头温足冷，皮肤赤色，吐利，五内七窍皆有疮黑点，
或如茱萸，外白内黑，灰白色。
外黑内赤，痘疮夹疹。
Abscesses and furuncles appearing after the resolution of smallpox are caused by residual toxic qi from the smallpox remaining in the meridians and collaterals, which then stagnates between the limbs and tendons. There are also cases arising from failure to resolve and promote dispersion after the lesions have flattened. The most effective prescription is Xiaochaihu Tang (Minor Bupleurum Decoction) with added Shengdihuang (Raw Rehmannia Root), or Qingliang Yin (Cooling Drink), Da Lianqiao Yin (Large Forsythia Decoction), Xiaodu Yin (Detoxification Drink), and Xijiao Dihuang Tang (Rhinoceros Horn and Rehmannia Decoction) can all be used.
When the smallpox lesions have resolved but residual heat remains, treatment should be based on the severity of the heat. For severe heat, promoting urination is indicated; for mild heat, resolving toxicity is appropriate. Promoting urination guides the heart fire downwards, so even without using cooling herbs, the residual heat will naturally dissipate. Resolving mild heat is necessary because unresolved mild heat will inevitably lead to severe heat. For mild heat, Daochi San (Guide Out the Red Powder) is utilized; for more significant heat, Xijiao Dihuang Tang (Rhinoceros Horn and Rehmannia Decoction) is used. Harsh purgatives must strictly be avoided. After smallpox, the stomach qi is deficient; using harsh purgatives would instead cause complications such as abscesses or other diseases. If there is body heat accompanied by other syndromes, Liuwei Chaihu Maimen San (Six-Ingredient Bupleurum and Ophiopogon Powder) is used. For sores in the throat, mouth, and tongue preventing suckling, Rusheng Maimendong Tang (Like-Sage Ophiopogon Decoction) is administered.
Observing the morphology and symptoms of the smallpox indicates the severity. Mild cases do not require medication, whereas severe cases demand early intervention and rescue. Whether the rash has erupted or not, if there is constipation, dark and scanty urine, fever, and thirst, this constitutes interior heat. Cooling blood, resolving toxicity, moistening the intestines, promoting urination, and detoxifying with formulas like Xiaodu Yin (Detoxification Drink) or Sisheng San (Four Sages Powder) are applicable. For initial vomiting, diarrhea, and anorexia, rapid regulation is required. Delay may lead to exhaustion of primordial qi, making recovery difficult. Cases with mild excess syndromes and favorable progression do not require tonics like Baoyuan Tang (Preserve the Origin Decoction). Using tonics when there is interior excess will likely result in lingering toxins forming abscesses; using tonics when there is exterior excess will lead to ulceration and pain of the spots.
Erupting in three or four batches, sparse on the head, eyes, chest, and abdomen, absent in the eyes, varying in size, plump and lustrous, red inside and out, with a red base and waxy-white tip.
Erupting simultaneously, dense as silkworm eggs, with warm body and abdominal distension, warm head and cold feet, reddish skin, vomiting and diarrhea, black spots on the five zang organs and seven orifices, resembling cornels, white outside and black inside, or grayish-white.
Black outside and red inside indicates smallpox complicated by measles-like eruptions.