肿之生也，皆由风邪寒热毒瓦斯，客于经络，使血涩不通，壅结皆成肿也。其风邪所作者
，肿无头无根，浮在皮上，如吹之状也。不赤不痛，或肿或散，不常肿。其寒气与血相搏作
者，有头有根，色赤肿痛。其热毒作者，亦无正头，但急肿，久不消，热气结盛，壅则为脓
。其候非一，故谓之诸肿。
凡人忽发肿，或着四肢，或在胸背，或着头项，水牢如畔大，虚肿回回，如吹之状，不
痛不赤。着四肢者，乃欲不遂，令人烦满短气，身体常冷。皆由冬月遇湿，风入人肌里，至
春复适大寒，风不得出，气壅肌间，不自觉；至夏取风凉，湿气聚不散而成肿，久不瘥，气
结盛生热，乃化为脓血，并皆烂败，则杀人。
右手关上脉浮而虚者，病肿。
火丹，发作于大腿，且游走不定，无固定部位，附着于皮肤使皮肤发红。
石火丹，丹毒遍布全身，像有花纹一样，眼睛突出如粟米状，皮肤颜色青黑。
肿的生成，都是由风邪、寒热毒气，侵袭经络，导致血液涩滞不通，壅结而形成的。由风邪引起的，肿没有头也没有根，浮在皮肤表面，像吹起来的样子，不红不痛，有时肿有时散，不会一直肿。寒气与血相搏结引起的，有头有根，颜色红赤肿痛。热毒引起的，也没有固定的头，只是急骤肿胀，久久不消退，热气郁结旺盛，壅滞就会化脓。其症状表现不一，所以称为诸肿。
人突然发生肿胀，或发生在四肢，或在胸背，或在头项，大小如水牢（一种容器）边缘那么大，虚肿回旋，像吹起来的样子，不痛不红。发生在四肢的，会导致肢体活动不利，使人烦闷短气，身体经常发冷。这都是因为冬天遇到湿气，风邪侵入肌肉内部，到了春天又遭遇大寒，风邪无法排出，气机壅滞在肌间，自己感觉不到；到了夏天贪凉取风，湿气聚集不散而形成肿胀，久不痊愈，气结盛而生热，进而化为脓血，全部腐烂败坏，则会致死。
Tian Zao Huo Dan (Heavenly Stove Fire Erysipelas) manifests when it erupts, necessarily in the inner aspect of both thighs, gradually extending to the glans penis with redness and swelling.
Fei Zao Huo Dan (Abandoned Stove Fire Erysipelas) manifests when it erupts, necessarily on the dorsum of the foot, with reddish skin color.
Niao Zao Huo Dan (Urine Stove Fire Erysipelas) erupts on the chest and abdomen, as well as the umbilicus, connecting to the glans penis where all areas become red.
Huo Dan (Fire Erysipelas) erupts on the back, and also on the arms, with reddish skin color.
Huo Dan (Fire Erysipelas) erupts on the thighs and wanders without a fixed location, adhering to the skin causing redness.
Ying Huo Dan (Firefly Erysipelas) erupts on the upper arm, extending to the hypochondrium, with reddish skin color.
Shi Huo Dan (Stone Fire Erysipelas) presents with erysipelas covering the whole body, resembling patterned fabric, with protruding eyes like millet grains, and bluish-black skin color.
The generation of swelling arises from wind pathogens, cold-heat toxic qi invading the meridians, causing blood stasis and obstruction, leading to congestion and accumulation that form swelling. When caused by wind pathogens, the swelling has no head or root, floats on the skin surface, resembling a blown-up state; it is not red or painful, sometimes swollen and sometimes dispersed, not constantly swollen. When caused by cold qi battling with blood, there is a head and root, with red, painful, and swollen characteristics. When caused by heat toxicity, there is no definite head, but rather acute swelling that persists for a long time without subsiding; excessive accumulation of heat qi leads to pus formation. Since the manifestations are not uniform, they are referred to as various swellings (Zhu Zhong).
When a person suddenly develops swelling, whether on the limbs, chest, back, head, or neck, large as the rim of a water jar, with fluctuant, circular swelling resembling a blown-up state, without pain or redness: if located on the limbs, it may lead to motor impairment, causing irritability, fullness, shortness of breath, and constant coldness of the body. This is all due to encountering dampness in winter, allowing wind to enter the muscle interior; in spring, upon exposure to severe cold, the wind cannot exit, causing qi stagnation between the muscles, often unnoticed; in summer, seeking coolness and wind causes dampness to gather and fail to dissipate, forming swelling. If prolonged and unhealed, qi stagnation generates intense heat, transforming into pus and blood, leading to rotting and decay, which can be fatal.
A floating and deficient pulse at the Guan position on the right hand indicates swelling disease.
Sudden onset of swelling without pain or redness, moving unpredictably and accompanied by itching, occurs because previously there was no illness, but the interstices were vacuous, encountering wind pathogens.
Feng Du Zhong (Wind-Toxin Swelling) initially presents with redness, pain, and heat, with blister formation on the swelling, resembling burns from fire.