What Hai Zao Yu Hu Tang is for
Hai Zao Yu Hu Tang is for the firm lump that will not disperse. It is used where nodules sit in the skin without heat or redness: cystic indurated acne, lipomas, old plaques that have hardened. The nodule is read as Phlegm held by stagnant Qi and firmed by Blood stagnation, so the approach is softening and moving over weeks rather than clearing an inflammation.
The lesion is firm and quiet. It is a nodule under the surface, sometimes one and sometimes a cluster, with skin over it that keeps its normal colour or looks slightly dull. Cystic acne of this type leaves hard deep lesions that do not come to a head. Lipomas feel soft to doughy but stay put for years. There is no throbbing, no spreading redness and no discharge, and that absence is what marks the lump as Phlegm rather than toxicity.
Hai Zao, Kun Bu and Zhe Bei Mu soften hardness and transform Phlegm, which is the core of the method. Ban Xia and Chen Pi dry Dampness and move Qi, Qing Pi frees the stagnation that holds the lump in place, and Dang Gui and Chuan Xiong move the Blood that makes it firm. Lian Qiao clears the small amount of Heat that can sit in a long-standing nodule, Du Huo reaches the channels, and Gan Cao harmonises the formula.
It is a slow formula for quiet nodules. Cystic indurated acne, lipomas and soft tissue lumps after assessment, and indurated plaques that are not inflamed all fit when the texture is firm and the skin is not hot. It is not for hot, red, spreading lesions, which need clearing, and it is not used in pregnancy. The seaweeds are high in iodine, so thyroid status matters, and any new or growing lump needs medical assessment first.
Actions
- Softens hardness and dissipates nodules
- Transforms Phlegm
- Moves Qi and Blood
- Clears mild Heat
Properties
- Taste and temperature: Predominantly bitter, salty and pungent. Salty softens hardness, bitter and pungent transform Phlegm and move Qi.
- Organs: Liver, Spleen, Lungs
- Channels: Liver, Spleen, Lung
The pattern behind it
The pattern is Phlegm and Qi stagnation congealing into a firm nodule. The Phlegm provides the substance, the stagnant Qi holds it in place, and the Blood stagnation makes it firm. The formula softens, transforms and moves, which is why it is used for fixed lumps rather than for hot inflammation.
Composition
The herbs in Hai Zao Yu Hu Tang, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Hai Zao | 4.5 to 24 g | Cold, Bitter, salty | A seaweed that softens hardness and transforms Phlegm, the leading softening herb. | |
| King | Kun Bu | 3 to 15 g | Cold, Salty | Works with Hai Zao to soften nodules and transform Phlegm. |
| King | Zhe Bei Mu | 3 to 10 g | Cold, Bitter, sweet | Clears Heat, transforms Phlegm and disperses nodules. |
| King | Ban Xia | 3 to 10 g | Warm, Pungent | Dries Dampness and transforms Phlegm, the core Phlegm herb. |
| Lian Qiao | 3 to 10 g | Slightly cold, Bitter | Clears mild Heat and resolves toxicity. | |
| Qing Pi | 3 to 6 g | Warm, Bitter, pungent | Moves Liver Qi strongly, addressing the stagnation that holds the lump. | |
| Chen Pi | 3 to 10 g | Warm, Pungent, bitter | Moves Qi and dries Dampness in the middle. | |
| Dang Gui | 3 to 15 g | Warm, Sweet, pungent | Nourishes and moves Blood, addressing the firmness of the nodule. | |
| Chuan Xiong | 3 to 10 g | Warm, Pungent | Moves Qi and Blood, supporting the softening. | |
| Envoy | Du Huo | 3 to 10 g | Slightly warm, Bitter, pungent | Reaches the channels and dispels obstruction, guiding the formula. |
| Gan Cao | 3 to 6 g | Neutral, Sweet | Harmonises the formula. |
Patterns it treats
Phlegm and Qi Nodules
Firm, non-inflamed nodules that sit in the skin without heat or redness, from cystic acne lesions to lipomas and indurated plaques. Phlegm supplies the substance, stagnant Qi holds it and congested Blood firms it. The formula softens and moves rather than clearing.
How the formula is built
Three softening herbs, two Phlegm-transforming herbs and a moving group. That combination lets a firm lump soften over weeks rather than being broken suddenly, which is why it suits chronic nodules rather than acute abscesses.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Decocted in water and taken warm, in two divided doses.
Modifications
- If the nodule is hard, more softening herbs are added.
- If Heat is present, cooling herbs are increased.
- If the Qi stagnation dominates, the Qi-moving herbs are increased.
- If the person is depleted, tonic support is added.
Timing
Taken warm in two divided doses.
Duration
Four to twelve weeks, reassessed as the nodule changes.
Diet while taking it
Avoid greasy and sweet food; reduce iodine-rich food if the thyroid is a concern.
Safety
Contraindications
Avoid in hot, red, spreading lesions and in pregnancy. Use care where the thyroid is involved, since the seaweed content is high in iodine. Any new or growing lump needs medical assessment.
Interactions
The high iodine content of the seaweeds can affect thyroid function and interact with thyroid medication, so thyroid status should be known before use.
Pregnancy
Contraindicated in pregnancy because the formula moves Blood and contains strongly dispersing herbs.
Breastfeeding
Use only under professional guidance.
Children
Used only with professional supervision.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and any new, growing or painful lump needs medical assessment before treatment.
General safety references
General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this formula.
- Review article: Herbal hepatotoxicity - an update on traditional Chinese medicine preparations. Alimentary Pharmacology & Therapeutics, 2014. PMID: 24844799.
- Interactions between herbal medicines and prescribed drugs: an updated systematic review. Drugs, 2009. PMID: 19719333.
- Warfarin and food, herbal or dietary supplement interactions: a systematic review. British Journal of Clinical Pharmacology, 2021. PMID: 32478963.
Origin and history
Wai Ke Zheng Zong (外科正宗, Orthodox Manual of External Medicine) by Chen Shigong, Ming dynasty, 1617.
Chen Shigong's surgical manual of 1617 included this formula for the firm nodule that will not disperse on its own. Its use of seaweeds to soften hardness is a classical technique, and the same logic is applied to cystic and indurated skin lesions.
Classical record
Chen Shigong recorded the formula for firm nodular swellings, softening the hardness with seaweeds and transforming the Phlegm with Qi-moving herbs.
Wai Ke Zheng Zong (外科正宗, Orthodox Manual of External Medicine), Chen Shigong, Ming dynasty, 1617.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
What is it used for?
Firm, non-inflamed nodules and swellings, including cystic acne lesions and lumps that need softening over weeks.
Why seaweeds?
Salty seaweeds are the classical substances for softening hardness. They work on the nodule's texture rather than only on the cause.
Is it safe for the thyroid?
The seaweeds are high in iodine and can affect thyroid function, so thyroid status should be known before use.
Should a lump be assessed first?
Yes. Any new, growing or painful lump needs medical assessment before it is treated as Phlegm.