夫热吐热泻，不可投燥药，伤寒而身热，不可便投凉药，疮疹发搐，不可投惊药，此皆
外同而内异也。《素问》云∶疮疡烦躁，痛痒皆出于心，今疮疹出于心，惊搐亦出于心也。
疮疹毒瓦斯始作，心火大盛则生风，生风则惊悸，甚则搐搦，热气蒸盛则烦躁，为疮疹则痛痒
矣，所以为惊搐，为烦躁，为痛痒，为疮疹，数证心所主者，必备无一阙焉。如始者毒瓦斯蕴
于心脏，则惊悸搐搦，医者不以内外证辨明之，不为疮疹防之，便以银粉脑麝青黛朱砂硝石
等投之，则心寒而肌敛，毒瓦斯内伏，是疮疹而惊搐者，无由而出也。此证似惊风，用药当作
疮疹防备之。盖疮疹之初似惊风者多，医者不审，便作惊风治之，为害不浅。大抵疮疹必有
他证相杂，必先有咳嗽痰涎，心神惊悸，烦躁呕吐，唇红颊赤，发渴耳冷足冷，脉数舌白，
如有此数证，则银粉凉心药，切不可用之，心一凉而肌敛，伏何由运出？又有小儿平常安乐
，皆无疾病，忽然发搐者，必是疮疹，尤当审谛之。盖毒瓦斯内盛，但以发散毒瓦斯，如惺惺散
、消毒散、升麻汤、红绵散，兼以快气利小便祛风等药与服之，此等药虽未能即效，亦不至
败事。其证次第，待其热气得泄于肌肤，心气亦自定矣。有风寒与内热相搏而惊搐者，则各
见其证治之，亦如前法，但加匀气药为妙。张氏云∶疮疹气匀即出，快气行即荣卫无滞。有
寒亦散，疮疹当自出矣。
凡是热性呕吐和热性腹泻，不可使用燥烈性质的药物；伤寒病伴有身体发热时，不可立即投用寒凉性质的药物；疮疹发作出现抽搐时，不可当作惊风来用药治疗。这些情况都是外表症状相同而内在病机不同。《素问》说：疮疡引起的烦躁、疼痛和瘙痒都源于心脏。如今疮疹出于心，惊厥抽搐也出于心。
当疮疹的毒气刚开始发作时，如果心火大盛就会生风，生风则导致惊悸，严重时会出现抽搐痉挛；热气蒸腾旺盛则导致烦躁，表现为疮疹并伴有疼痛和瘙痒。因此，惊搐、烦躁、痛痒、疮疹这几种证候，都是由心所主掌的，必须具备且无一缺失。
如果在初期毒气蕴结于心脏，导致惊悸、抽搐痉挛，医生如果不分辨内外证候，不为疮疹做预防处理，就立即投用银粉、冰片、麝香、青黛、朱砂、硝石等寒凉药物，就会导致心气受寒而肌表收敛，毒气内伏，使得本应从体表发出的疮疹因惊搐而无法透发出来。此证看似惊风，用药应当按防备疮疹的原则处理。大概疮疹初起时类似惊风的情况很多，医生如果不仔细审察，就当作惊风来治疗，造成的危害不浅。
大体上，疮疹必然有其他证候夹杂其中，必定先有咳嗽、痰涎、心神惊悸、烦躁、呕吐、嘴唇红、脸颊赤、口渴、耳朵冷、脚冷、脉数、舌苔白等症状。如果有上述几种证候，那么银粉等寒凉清心的药物切不可使用，一旦心气变凉，肌表收敛，毒气如何能运出体外？又有小儿平时安乐健康，没有任何疾病，突然发生抽搐的，必定是疮疹，尤其应当仔细审察。因为毒气内盛，只需用发散毒气的药物，如惺惺散、消毒散、升麻汤、红绵散，兼以理气、利小便、祛风等药物一起服用。这些药物虽然不能立即见效，但也不至于败坏病情。其病程次第的发展，要等到热气在肌肤得以宣泄，心气自然安定。
若有风寒与内热相互搏结而导致惊搐的，则分别根据其证候进行治疗，也像前面的方法，只是加入调匀气机的药物更为巧妙。张氏说：疮疹气机调匀就能透发，理气通畅则营卫运行无阻滞。即使有寒邪也能散去，疮疹自然就会透发出来。
In cases of heat-induced vomiting and diarrhea, drying agents should not be administered. In Shaoyang disease (Taiyang cold damage) accompanied by fever, cooling agents should not be immediately prescribed. When eruptive diseases (chuang zhen) present with convulsions, they should not be treated as fright disorders (jing feng). These are all instances where the external manifestations are similar but the internal pathogenesis differs. The *Suwen* states: "Irritability, pain, and itching arising from sores and ulcers all originate from the Heart." Thus, eruptive diseases stem from the Heart, and convulsions also stem from the Heart.
When the toxic factors of eruptive diseases first arise, excessive Heart Fire generates Wind; generating Wind leads to palpitations and fright, and in severe cases, convulsions and spasms. Vigorous steaming of heat causes irritability, manifesting as eruptive lesions accompanied by pain and itching. Therefore, among the syndromes of convulsions, irritability, pain/itching, and eruptions, those governed by the Heart must be present without omission. If initially, toxic factors accumulate in the Heart, causing palpitations and convulsions, and the physician fails to distinguish between interior and exterior signs or does not prepare for eruptive diseases, but instead administers cold-natured drugs such as Calx Argenti (Silver Powder), Borneolum Syntheticum (Bingpian), Moschus (Shexiang), Indigo Naturalis (Qingdai), Cinnabar (Zhusha), and Natrii Sulfas (Xiaoshi), the Heart becomes cold and the muscle layer contracts. Consequently, the toxic factors remain trapped inside, preventing the eruptive diseases from emerging through the skin despite the convulsions. This condition resembles Fright Wind (Jing Feng); medication should be administered with precautions for eruptive diseases. It is common for early-stage eruptive diseases to resemble Fright Wind; if physicians fail to examine carefully and treat them as Fright Wind, the harm inflicted is profound.
Generally, eruptive diseases are always mixed with other symptoms. Initially, there may be coughing, phlegm, mental palpitations, irritability, vomiting, red lips, flushed cheeks, thirst, cold ears, cold feet, rapid pulse, and white tongue coating. If these several signs are present, cold-natured Heart-cooling drugs like Silver Powder must absolutely not be used. Once the Heart becomes cold and the muscle layer contracts, how can the trapped pathogens be expelled? Furthermore, children who are usually healthy and free of disease but suddenly develop convulsions likely have eruptive diseases; this requires particularly careful examination. Since the toxic factors are abundant internally, one should use formulas that disperse toxic factors, such as Xingxing San (Stimulating Powder), Xiaodu San (Detoxifying Powder), Shengma Tang (Cimicifuga Decoction), and Hongmian San (Red Cotton Powder), combined with herbs that promote Qi circulation, promote urination, and dispel Wind. Although these remedies may not yield immediate results, they will not ruin the treatment outcome. As the progression unfolds, once the heat is vented through the skin, the Heart Qi will naturally settle.
If convulsions arise from the struggle between Cold-Wind and Interior Heat, each syndrome should be treated according to its specific presentation, following the previous methods but ideally adding herbs that harmonize Qi. Zhang Shi stated: "When the Qi of eruptive diseases is harmonized, they will emerge; when Qi moves freely, Ying and Wei (Nutritive and Defensive Qi) flow without stagnation." Even if Cold is present, it will be dispersed, and the eruptive diseases will naturally emerge.