天火丹者，肉中忽赤，如丹涂之色，痛痒不定，甚至遍身。白丹者，肉中肿起，痒痛如
吹状。鸡冠丹者，亦名茱萸丹，肉上粟起如鸡冠。水丹者，遍体热，起黄色，如水在皮中。
五色油丹者，亦名油肿、赤硫丹，肿热，赤色流入四肢。以上皆不问大小，如天火、骨火、
殃火、尿灶、朱田、野火等丹，多着少小，但自腹内生出四肢者，则易愈；自四肢生入腹者
，则难治。
治诸种丹毒，发于四肢、腹背、头面，或赤或
白，或痒或痛，或寒或热。
香栾皮（一两）
上以一大碗水同煎，取半碗，以翎毛刷患处神效。
治少小诸种丹毒。
伏龙肝（不拘多少）
上为末。以鸡子白和敷之，日三次。
治一切丹毒。
郁金 黄芩 甘草 山栀 大黄 黄连 糯米
上七味，各一两，生，为末。蜜和冷水调，以鹅毛上患处。
治丹毒方，《千金》《外台》甚多，无出用至冷物，凡至冷物，无过藻菜，如有患丹毒
热肿等，取渠中藻菜，细切熟捣敷丹上浓三分，干则易之最良。
世医论瘾疹，无不谓是皮肤间风，然既分冷热，冷热即寒暑之证。又有因浴出凑风冷而
得之者，岂非湿也。则知四气备矣。《经》云∶诸痛痒疮皆属于心。心实热则痛，虚寒则痒
。又阳明主肌肉，属胃与大肠，亦有冷热分痛痒，不可不审。世人呼白者为婆膜，赤者为血
风，名义混淆，当以理晓。内则察其脏腑虚实，外则分其寒暑风湿，随证调之，无不愈。
天火丹，表现为皮肤肌肉中突然发红，像涂了丹砂一样的颜色，疼痛和瘙痒不定，严重时甚至遍布全身。白丹，表现为皮肤肌肉中肿胀突起，痒痛的感觉如同被风吹吹过的痕迹。鸡冠丹，又名茱萸丹，皮肤上隆起如粟米状，形状像鸡冠。水丹，表现为遍身发热，出现黄色皮疹，感觉像水在皮肤里面流动。五色油丹，又名油肿、赤硫丹，表现为肿胀发热，红色蔓延流入四肢。以上这些病症，无论病情轻重，诸如天火丹、骨火丹、殃火丹、尿灶丹、朱田丹、野火丹等丹毒，大多发生在婴幼儿身上。如果是从腹部内部生出并蔓延至四肢的，则容易治愈；如果是从四肢生出并深入腹部的，则难以治疗。
治疗各种丹毒，发病部位在四肢、腹背、头面，症状或红或白，或痒或痛，或寒或热。
取香栾皮（一两）
用一大碗水同煎，煮取半碗药液，用羽毛刷涂抹患处，效果神奇。
治疗婴幼儿的各种丹毒。
取伏龙肝（不限数量）
将伏龙肝研成粉末。用鸡蛋清调和后敷在患处，每天三次。
治疗一切丹毒。
郁金、黄芩、甘草、山栀、大黄、黄连、糯米
以上七味药，各取一两，生用，研成粉末。用蜂蜜和冷水调匀，用鹅毛蘸取涂于患处。
治疗丹毒的方剂，《千金方》《外台秘要》中记载很多，没有超过使用极冷药物的。凡是极冷的药物，没有比藻菜更合适的。如果有患丹毒、热肿等情况，取渠道中的藻菜，细细切碎后煮熟捣烂，厚厚地敷在丹毒处约三分厚，干了就更换，这是最好的方法。
世间的医生论述瘾疹（荨麻疹），无不认为是皮肤间的风邪所致。既然分为冷型和热型，冷热即对应寒暑的症状。又有因为洗澡后受风冷侵袭而得病的，这难道不是湿邪吗？由此可知四气（风、寒、暑、湿）都具备了。《黄帝内经》说：所有的疼痛、瘙痒、疮疡都归属于心。心实热则表现为疼痛，心虚寒则表现为瘙痒。另外，阳明经主司肌肉，属于胃与大肠，也有因冷热不同而区分疼痛和瘙痒的情况，不可不仔细审察。世人称呼白色的为“婆膜”，红色的为“血风”，名目混淆，应当以医理来阐明。对内则考察脏腑的虚实，对外则分辨寒暑风湿，随证调理，没有不痊愈的。
Tianhuo Dan (Sky Fire Erysipelas) manifests as a sudden redness in the flesh and skin, resembling the color of cinnabar applied to the surface, with unpredictable pain and itching, and in severe cases, it may cover the entire body. Bai Dan (White Erysipelas) presents as swelling and elevation within the flesh, with itching and pain resembling the sensation of being blown upon. Jiguan Dan (Chicken Comb Erysipelas), also known as Zhuyu Dan (Cornel Erysipelas), features grain-like elevations on the skin resembling a chicken comb. Shuidan (Water Erysipelas) is characterized by generalized heat and yellowish eruptions, giving the sensation of water trapped beneath the skin. Wuse You Dan (Five-Color Oil Erysipelas), also named Youzhong (Oil Swelling) or Chisuliu Dan (Red Sulfur Erysipelas), involves swelling and heat, with redness spreading into the four limbs. For all the aforementioned conditions, regardless of severity, such as Tianhuo Dan, Guhu Dan (Bone Fire Erysipelas), Yanghuo Dan (Calamity Fire Erysipelas), Nizaodan (Urine Spot Erysipelas), Zhutian Dan (Vermilion Field Erysipelas), Yehuo Dan (Wild Fire Erysipelas), etc., they mostly occur in infants and children. If the eruption originates from the interior of the abdomen and spreads to the four limbs, it is easy to cure; if it originates from the four limbs and penetrates into the abdomen, it is difficult to treat.
To treat various types of erysipelas occurring on the four limbs, back, abdomen, head, and face, presenting with redness or whiteness, itching or pain, cold or heat sensations:
Xiangluan Pi (Citrus Reticulata Peel, 1 liang)
Decoct with one large bowl of water until half a bowl remains. Apply to the affected area using a feather brush for miraculous efficacy.
To treat various types of erysipelas in infants and children:
Fulonggan (Dragon's House Earth, quantity不拘/unrestricted)
Grind into powder. Mix with egg white (Jizi Bai) and apply to the affected area three times daily.
To treat all kinds of erysipelas:
Yujin (Curcuma Aromatica Rhizome), Huangqin (Scutellariae Radix), Gancao (Glycyrrhizae Radix et Rhizoma), Shanzhi (Gardeniae Fructus), Dahuang (Rhei Radix et Rhizoma), Huanglian (Coptidis Rhizoma), Nuomi (Oryza Sativa Glutinosa Semen)
Take seven ingredients, each 1 liang, raw, and grind into powder. Mix with honey and cold water to form a paste, and apply to the affected area using a goose feather.
There are many formulas for treating erysipelas in *Qianjin Fang* and *Waitai Miyao*, none exceeding the use of extremely cold substances. Among extremely cold substances, algae (Zaocai) is the most suitable. For patients with erysipelas, hot swelling, etc., take algae from ditches, finely chop, cook thoroughly, and mash. Apply thickly (about 3 fen) onto the erysipelas. Replace when dry; this is the best method.
Physicians of later generations discuss Yin Zhen (Urticaria/Hives), invariably attributing it to wind pathogen in the skin. Since it is divided into cold and heat types, these correspond to cold and summerheat syndromes. Furthermore, some contract it after bathing due to exposure to wind-cold, which implies dampness. Thus, it is understood that all four qi (wind, cold, summerheat, dampness) are involved. The *Classic* states: "All pain, itching, and sores belong to the Heart." Excess heat in the Heart causes pain, while deficiency cold causes itching. Moreover, the Yangming channel governs the muscles and belongs to the Stomach and Large Intestine; there are also distinctions between pain and itching based on cold and heat, which must be carefully examined. Common people refer to the white type as "Pomo" and the red type as "Xuefeng" (Blood Wind), causing confusion in nomenclature, which should be clarified through medical principles. Internally, examine the deficiency or excess of the Zang-Fu organs; externally, differentiate cold, summerheat, wind, and dampness. Adjust treatment according to the syndrome, and recovery will surely follow.