Poison Ivy: If You Can’t Avoid It, How to Treat It with TCM

Poison Ivy turns colors earlier than many other plants along the Front Range of Colorado, making it really easy to spot.

When I was 12 years old, my best friend Ali and I went leaf collecting in October.  We found the most beautiful leaves blazing with red, orange, yellow AND purple all on one leaf!  They were probably the most beautiful leaves we had ever seen.  We meticulously placed our collection in an album and admired our work with great satisfaction.   The next day our hands and faces swelled and itched and then we broke out in a terrible oozing rash all  over.  Those gorgeous leaves we had so proudly collected were poison ivy.  Ali’s dad tried to scold us and educate us on the identification of poison ivy, but he kept snickering because he knew we were paying the price for our ignorance and we would NEVER make that mistake again.  I was out of school for over a week and had to have steroid injections to bring the swelling down.  My face was so swollen you could only see the tip of my nose and my hands were gnarled with knobby, witch-like fingers that bubbled with ooze.  The blisters were also on the whites of my eyes and in my mouth and throat.  The discomfort was unbearable.  UNBEARABLE.

Poison Ivy in Summer. Can grow as a low ground cover, a large shrub, or creeping vine.

Poison Ivy as an Allergen

Poison ivy, poison oak, and poison sumac are all plants commonly found in the United States and the resultant rash from contact with these plants is the most common cause of allergic contact dermatitis.  They belong to the family of plants known as Anacardiaceae and the genus Toxicodendron (formerly known as “Rhus” which is why the rash from these plants is still sometimes referred to as Rhus dermatitis). Allergic contact dermatitis due to plants (allergic phytodermatitis) is a Type IV Sensitivity Reaction, meaning you have to be exposed to the substance at least once before developing an allergy to it.  The oleoresins (milky/resinous sap) found in the Toxicodendron plants are referred to as urushiol.  This urushiol is made up of a mixture of chemicals, including a group of haptens called Pentadecylcatechols: these are the specific chemicals within the urushiol that are the sensitizing substances responsible for causing allergic skin reactions from contact with these plants.  The rashes from poison ivy, poison oak, and poison sumac will each look identical regardless of which plant caused it because each of those plants contains the same allergens.  Interestingly, other plants related to poison ivy that can also cause hypersensitivity reactions include cashew nut trees, mango trees, Japanese lacquer trees, and Brazilian pepper.   Unroasted cashew nuts, mango rinds, and furniture lacquer can all cause similar rashes (in older TCM texts, allergic contact dermatitis is actually referred to as “Lacquer Sores”).

The urushiol that contains the allergens in poison ivy can be found in the all parts of the plant: the leaves, the stem, the seeds, the flowers, the berries and the roots.  That means you can get a rash from poison ivy AT ANY TIME OF THE YEAR if you come into contact with ANY PART of the plant.  Not only that, but you have to wash the urushiol off immediately upon exposure (soap and water just fine):  after 10 minutes only 50% of the urushiol will come off, after 30 minutes only 10% will come off, and after an hour you are pretty much screwed because it cannot be removed.  So your best bet is to avoid exposure in the first place.

Avoid Exposure

Poison Ivy can look like a shrub or vine or ground cover so beware of all its forms.

Being able to clearly identify poison ivy is your key to avoiding it.  This resilient plant can take many forms:  low ground cover, creeping vine (though it technically isn’t an “ivy”), or tree-like shrub.  It is lighter green in spring, dark green in summer, and all sorts of beautiful colors in the autumn.  Its leaflets are almond-shaped and grow in groups of three, hence the warning “Leaves of three, leave it be!”  Some leaflets will have one or a few notches along their edge, but not always.  Often, the leaves will have a sheen to them and they may droop just a little bit.  For more info on identifying this poison ivy, check out this Wikipedia article (I rarely consider Wikipedia a reliable source, but this article gives a useful description of the plant and has good photos).

So obviously, to avoid the itchy rash associated with poison ivy, avoid coming into contact with any part of the plant.  Urushiol can penetrate damp clothing, so wet clothing will not offer full protection from poison ivy.  It is also important to immediately wash any clothing that came into contact with the plant because if you later come into contact with contaminated clothing you can be exposed to the urushiol and still develop a rash.  Pet fur is also something to avoid if your dog or cat may have brushed up against poison ivy as the urushiol can be transferred to your skin if you pet them.   Do not burn poison ivy (any part of the plant) as particulates in the smoke can carry the urushiol and get to your throat.  You CANNOT contract the rash by coming into contact with another person who has poison ivy rash because the blisters do NOT contain urushiol.

Although we are talking about poison ivy, it is worth mentioning that you should also avoid eating unroasted cashew nuts and mangoes that are unpeeled as contact with these foods can expose your lips to the urushiol from those plants.

Clinical Presentation:

A close-up of the characteristic linear lesions with fluid-filled vesicles
Copyright © 2012 Elsevier Inc.

Depending on previous sensitization, the poison ivy rash can appear as quickly as 8 hours after contact with the plant or as long as 12 days later.   New lesions can continue to appear for more than a week after the initial rash symptoms develop (this is not due to spreading the urushiol from scratching blisters as the blisters do not contain any urushiol).  Severity of the reaction will vary in the individual based on their level of sensitization, how much urushiol contacted the skin, and where the urushiol contacted skin (some regions of the skin are simply more sensitive).  Linear lesions are the telltale signs of poison ivy rash because they form when the skin brushes against a leaf, drawing it along the skin.  Linear trails of blisters can also be formed when the skin is scratched while the urushiol is still on the skin and thus gets spread along in a line.  If a person brushes up against animal fur that has the urushiol on it then the rash tends to form in a more diffuse pattern.  (Or if you inadvertently collect the leaves and carry them around for a while you will get the rash EVERYWHERE!).

Linear lesions with multiple areas of erythema
Copyright © 2012 Elsevier Inc.

Usually the rash starts with itching before any redness or blisters appear.  Itching can be very intense.  If only a small amount of urushiol contacted the skin, then it may only develop some minor erythema (redness and inflammation).  But larger quantities of the urushiol can lead to severe vesiculation (lots of blisters filled with clear fluid).  Scratching can lead to secondary infection of the lesions so try not to scratch even though it itches like crazy!  Blisters can become crusty after rupturing.  Large blisters can be drained but be sure not to rip off the top layer of the blister.  In severe cases, hemorrhagic blister can form (blood in the blisters).

Home Treatment

Once the allergic substance is removed from contact with the body, allergic phytodermatitis (allergic contact dermatitis due to plants) will usually resolve within 2 weeks all on its own.  But the discomfort from such rashes is worth treating to reduce the intensity of symptoms and to possible decrease the duration of the rash.  Home remedies that offer some soothing relief from itching and inflammation include cool baths with colloidal oatmeal (Aveeno) and the application of cold, wet compresses.  Cold compresses can be applied for 20 to 30 minutes several times per day as necessary to control symptoms for the first few days.  Calamine or Caladryl lotion can be applied but extended use can lead to over-drying of the skin.  I prefer using paste made from French Green Clay (often available for purchase in health food stores).  Mix the green clay with enough water to form a paste the consistency of paint (not as thick as mud or it will be too difficult to spread on, but so watery as to drip while you are applying it).  Let it dry completely (about 10 to 15 minutes) before soaking it off in a cool bath; DO NOT SCRUB IT OFF.   Scrubbing may feel very satisfying in the moment, but it will irritate the skin and worsen the inflammation.

Natural TCM Treatments


Both acupuncture and Chinese herbs are helpful to reduce the symptoms of itching and inflammation.  For the practitioner, acupuncture points to choose from include Bai Chong Wo, LI 11, LI 4, TW 2, SP 10, SP 6, BL 40Ying-Spring points along affected channels, or bleeding Jing-Well points along affected channels.  I really like connecting SP 10 to SP 6 with electro-stim to help reduce itching and redness for these kinds of rashes.  Plum blossom tapping around the edges of lesions can reduce itching but do not be too aggressive with it.

Internal Herbal Formula

The main TCM diagnosis for poison ivy is Wind Damp Heat with Heat Toxins.  The Treatment Principal is to Dispel Wind, Stop Itching, Clear Heat, Dry Damp and Resolve Toxins.  I think herbs are great to treat poison ivy and my patent formula of choice is Xiao Feng San to control itching.  The patent form will work well, but if there are many blisters you may choose to prescribe granules so you can add more herbs to Dry Damp and Resolve Toxins to make it even more effective. [See comments below for additional TCM Differentiation and treatments]

Di’s Poison Ivy Formula

(For Acute Symptoms of Itching with Fluid-filled Vesicles)

Ku Shen 12 grams
Huang Qin 12g
Huang Bai 9g
Shi Gao 15g
Hua Shi 15g
Fang Feng 9g
Bai Xian Pi 12g
Cang Zhu 12g
Ma Chi Xian 15g
Gan Cao 6g

If itching is really severe, also add Bai Ji Li and Chan Tui.  If lesions are really weeping, add Di Fu Zi.  If the rash is mostly on the upper body/face, add Sheng Ma.  For children who can’t stop scratching, add Zi Hua Di Ding to reduce risk of secondary bacterial infection in the lesions.

External Treatment

You can take the above internal formula and use it as a cold compress.  Either make the decoction and let it cool or use powdered raw herbs (not concentrated granules) to make a tea.  Steep a clean cloth in the cooled tea/decoction and apply for 20 minutes at a time, 3 times per day to the affected areas.  You can also make an herbal paste.  Use Qing Dai San alone. Or I like adding Qing Dai and Shi Gao to a little bit of French Green Clay (cosmetic clay).  Add enough water to form a paste the consistency of paint and spread it on the lesions (be careful – it may temporarily stain fabric).  Allow to dry fully before rinsing off.  Rinse off in a cool shower or bath – do NOT try scrubbing the dried paste off as this will aggravate the already irritated skin instead of helping to ease symptoms.

Have a good home remedy for poison ivy that you’d like to share?  Leave a comment and share your story below.




Tags: allergic reaction, Chinese herbal medicine, Chinese Medicine Dermatology, contact dermatitis, dermatitis, herbal skin care, keep, plant allergy, poison ivy, rashes, rhus dermatitis, skin rash, TCM

Topics: Allergies, Chinese Medicine, Herbs for Skin Care, Rashes

Publish Date: September 26, 2011     *Articles may include updates since original publishing.

About the Author ()

Diana Hermann is a licensed acupuncturist and board certified in Chinese Herbal Medicine. She received her Master Degree in Acupuncture and Oriental Medicine from the Oregon College of Oriental Medicine in Portland, OR and trained in China at the Nanjing University of Traditional Chinese Medicine. Diana treats patients in her Fort Collins, Colorado clinic and hand crafts herbal skin care products for her company Zi Zai Dermatology. In 2015, she completed the Diploma In Chinese Medicine Dermatology program from Avicenna in London, UK. She completed the program for a second time in 2019 in Chicago.

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  1. Diana Moll says:

    Great recommendations! We have Poison Oak here which I treat internally with Yin Qiao San (if you can believe it) works like a charm and is easy to find too. I had an east coast friedn who got PIvey and it worked on that too.

    • Yes, I should have mentioned the use of Yin Chiao San or Yin Chiao Chieh Tu Pian. It is most appropriate for the TCM differentiation of Wind Heat. For poison ivy, this is the stage when there is much itching and redness but not yet many vesicles. It can be quite effective especially if the patient takes it immediately, at the VERY FIRST signs of rash. It works along the same idea as treating chicken pox – you can’t stop the reaction, but you can speed it up by pushing it out faster. We have poison oak here in Colorado, too, though it is less common than poison ivy. The rash (and its treatment) are exactly the same regardless of which plant was the culprit.

  2. Diana Moll says:

    PS and gnarly photos, make me itchy looking at them!

  3. Terry Fox says:

    Thanks for the education. I had no idea that we had poison ivy (or poison oak) in Colorado. Now I know what to look for. As the old GI Joe cartoons said, “And knowing is half the battle!”

  4. Aliah E. says:

    Wow! What a fascinating article! I hate poison ivy!

  5. Jon phillips says:

    Great article, thanks for the info. I am an acupuncture student, who’s partner has a major poison ivy allergy. The electrical stim seems to be helping!

  6. Caryn says:

    Hi Diana,
    I really enjoyed reading this post since I teach at an acupuncture school (I’m a biologist/anatomy person, not an acupuncturist- but am an artist too) but I’m also someone who has a terrible case of poison ivy! I just tried a treatment for damp wind am hoping it will help with the severity. I did want to ask since you have extensive background in dermatology. I scar very easily (I already have tons of old acne scars) Do you have anything topically for old scars and presumably new ones judging by the severity of the blisters? I’ve been trying essential oils for years to help heal up better.

    • I’m working on scar treatments now. Acne scars can respond well to microdermabrasion if they aren’t too deep. Poison ivy should not scar (as long as you don’t scratch it). Those blisters are quite superficial (unlike the deep blisters and ulcerations that can develop in shingles). Be sure to add “Clear Heat” to your current treatment plan – poison ivy rashes definitely have a lot of Toxic Heat as well as Dampness.

  7. Anonymous says:

    Thank you for your well-written, concise and informative article. I will be using this treatment soon! Looking forward to more articles on how acupuncture alone can help skin conditions when you do not have access to herbs. Thank you so much.

  8. lawrence pendergrass says:

    first points to clear damp heat-spleen and all around for external toxic heat-thanks koryo hand therapy and doing clinic for tcm accupuncture.

  9. Both acupuncture and Chinese herbs are helpful to reduce the symptoms of itching and inflammation.

  10. Marilyn says:

    This post is very helpful in the way you explain the various stages, and possible variations of eruptions. I’m an LAc, and am just beginning to jump into a deeper understanding of differentiation of dermatological problems/illnesses. I also appreciate your mix of formal and informal style of writing, keepin’ it real! Just recently I had tonsillitis that went to laryngitis. About 10 days in I developed a small spot/lesion on my chest, just lateral to CV17. Deep neurological pain and insane itchiness. I’ve had it before, but it just went away after a week, soothed with a little aloe vera, and no lesion developed. This time, it is excruciating and yet it is so small! I did surround the dragon/lesion and came to your website to look and see if you had written anything up that I might find useful. And here we are. The needles are out and the pain and itching gone. I’ll be using some of your shared knowledge above to adjust my herbs, and I’m sure I’ll get it before it goes haywire. This will also help me oust the final bits of the viral infection from my throat.

    All this to say, thank you for taking time to write it out. This is the second time your writing has been helpful. The last time was the solving of the much more mysterious (to me) problem of being allergic to propolis, and my mystery John Waters’ mustache rash.

    I’m deciding whether/when I’ll take the same course you went through, I have to time it with other things. In the mean time, do you have an opinion on a reference book until I can take the courses? The two I’m looking at are, Dermatology in Traditional Chinese Medicine by Xu Yihou and Manual of Dermatology in Chinese Medicine by De-Hui Shen. Just recently I’ve got several people with different skin problems and I’m needing more, deeper insight and ideas.

    • Glad my posts have been helpful to you! I would tweak some of these protocols/formulas now (I’ve accumulated several more years of clinical experience since writing this post), but it is a good starting point. For a text reference, I recommend the big yellow book by Xu.

  11. Rick DeTroye says:

    Thanks for the great article, Diana! A preventive measure my wife and I use when hiking in the poison oak-ridden Columbia Gorge is post-hike wash down of all exposed areas with Tecnu soap. This soap breaks down the irritating oils of Toxicodendron plants and contains a very mild abrasive to help lift the oils off the skin. We use it whenever we suspect we’ve been exposed. I’ve hiked on a lot of trails with poison oak and never had a breakout. Tecnu is available at REI and many pharmacies. Also, another acupuncture technique to try is a point Kiiko Matsumoto uses for treating skin issues: Bilateral LI15 needled in the most tender spot and followed with 21 applications of thread moxa (these should feel warm or should “pinch” when applied). I’ve never used it for poison oak exposure, but have used it for rashes, itchy skin, hives. It works great, often immediately or shortly after treatment. KD9 (tender spot) and KD27 can also be added to help with ridding the body of the toxins.

    • I’ve heard Tecnu is very helpful…but time is still of the essence….wash off as soon as possible and remember that clothing/gear with the oil on it can get on you again later if you are not careful. Thank you for sharing the Kiiko protocol!

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