Poison Ivy - Oak or Sumac  
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This Care Guide Covers:

  • Red rash with small blisters after touching poison ivy, oak, or sumac

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Poison Ivy Plant (Example 1)
Poison Ivy Plant (Example 1)

Poison Ivy Rash on Forearm
Poison Ivy Rash on Forearm

Poison Ivy Rash on Wrist
Poison Ivy Rash on Wrist

Poison Sumac Plant
Poison Sumac Plant

Poison Ivy Plant (Example 2)
Poison Ivy Plant (Example 2)

Poison Oak Plant
Poison Oak Plant

When to Call Your Doctor

Call Your Doctor Now (night or day) If
  • You feel weak or very sick
  • Trouble breathing or severe coughing after being near to burning weeds
  • Fever and bright red area or streak (from open poison ivy sores)
  • Spreading redness from poison ivy rash (larger than 2 inches or 5 cm)
Call Your Doctor Within 24 Hours (between 9 am and 4 pm) If
  • You think you need to be seen
  • Swelling is severe (eyes are swollen shut)
  • Severe poison ivy reaction in the past
  • Severe itching keeps you from working or going to school
  • Rash involves more than 25% of the body
  • Face, eyes, lips, or genitals are involved
  • Big blisters or oozing sores
  • Taking steroids for more than 24 hours and rash gets worse
Call Your Doctor During Weekday Office Hours If
  • You have other questions or concerns
  • Rash lasts more than 3 weeks
Self Care at Home If
  • Mild poison ivy, oak, or sumac rash
Causes & Health Information

Some Basics...

Symptoms

Prevention

Here are some tips for preventing the rash from Poison Ivy, Poison Oak, or Poison Sumac.

CARE ADVICE FOR MILD RASH FROM POISON IVY, OAK, OR SUMAC

  1. What You Should Know:
    • Poison Ivy, Sumac, and Oak are plants that can cause an itchy, red rash in some people. The oil contained in the plant leaves irritates the skin.
    • You can treat poison ivy, sumac, or oak rashes at home.
    • Here is some care advice that should help.
  2. Cold Water for Itching: Soak the itchy skin in cool water for 20 minutes. You can also massage it with an ice cube. Do this as often as needed to help with the itching and oozing.
  3. Hydrocortisone Cream for Itching:
    • Put 1% hydrocortisone cream on the rash 4 times a day. This will help with the itching. Use it for 5 days.
    • Keep the cream in the fridge. It feels better when put on cold.
    • Sold over-the-counter (OTC) in the United States as 0.5% and 1% cream.
    • Sold OTC in Canada as 0.5% cream.
  4. Antihistamine Drugs for Itching: Take an antihistamine to help with the itching. Diphenhydramine (Benadryl) is a good choice. It is sold over-the-counter (OTC).The adult dose is 25-50 mg. You can take it up to 4 times a day.
    • Do not take these drugs if you have an enlarged prostate.
    • They may make you feel tired. Do not drink, drive, or use dangerous machinery while taking antihistamines.
    • An OTC antihistamine that causes less sleepiness is loratadine (Alavert or Claritin).
    • Read all package instructions.
  5. Avoid Scratching: Try not to scratch the rash. This could cause a secondary infection from bacteria.
  6. New Blisters Appear:
    • If you get new blisters a few days after the first ones, you may have come into contact with the plant oil again.
    • Did you wear clothes that still have the plant oil on them? If yes, you need to wash the clothes.
    • Could it be on your shoes? If yes, clean the shoes.
    • A family dog can carry the plant oil on its hair from being out in the woods or fields. Is this a possibility? If yes, you need to shampoo the dog. Be certain to wear rubber gloves when you do!
  7. Spreading the Rash:
    • Poison ivy or oak is not contagious. Poison ivy or oak rash cannot be spread to others.
    • However, remember that the plant oil can stay on your clothes. It can also be carried in your pet's fur.
  8. What to Expect: The rash most often lasts 2 weeks. Treatment will help with the severity of the symptoms, not how long they last.
  9. Call Your Doctor If:
    • Rash lasts more than 3 weeks
    • It looks infected
    • You get worse

Remember! Call your doctor if any of the "When to Call" symptoms occur.

Disclaimer: This information is not intended be a substitute for professional medical advice. It is provided for educational purposes only. You assume full responsibility for how you choose to use this information.


Author and Senior Reviewer: David A. Thompson, M.D.

Last Reviewed: 9/1/2012

Last Revised: 3/20/2013

Content Set: Adult Symptom Checker

Copyright 2000-2012. Self Care Decisions LLC; LMS, Inc.