Poison Ivy Rash
August 05, 2026August 5, 2026
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How to Treat a Poison Ivy Rash — and When to See a Provider

By Tim Montag, PA-C, Walk-In Clinic

If an itchy rash showed up a day or two after yard work or a hike, poison ivy may be to blame. Most people who touch the plant get a rash. Here’s what the rash looks like, how to treat it at home, and when to see a provider.

What does poison ivy look like?

Look for glossy leaves in groups of three on a plant growing about knee high. In our area, poison ivy grows along trails, fence lines, lakeshores, and the edges of yards, often where mowed grass meets the woods. Remember the rule of thumb: leaves of three, let it be.

Not sure about the plant in your yard? The Minnesota DNR has photos and tips for identifying it.

What does a poison ivy rash look like?

 Red, very itchy patches, often in streaks or lines where the plant brushed your skin

  • Small bumps or blisters that may weep clear fluid
  • Shows up 12 hours to 3 days after contact — sometimes longer if it’s your first exposure
  • Usually lasts 1 to 3 weeks

Is poison ivy contagious?

No. You can’t get the rash from another person, and the fluid in the blisters doesn’t spread it. Only the plant’s oil, called urushiol, spreads the rash. The oil can linger on clothing, gloves, garden tools, and pet fur, so wash anything that touched the plant. If new patches appear over several days, that’s because skin absorbs the oil at different rates, not because scratching spread it.

How to Treat Poison Ivy at Home

 Wash the area with soap and cool water as soon as you can after contact.

  • Apply cool, wet compresses or take a lukewarm oatmeal bath to calm itching.
  • Use calamine lotion or over-the-counter hydrocortisone cream.
  • An oral antihistamine such as diphenhydramine at night can relieve itching and help you sleep; ask your provider or pharmacist before giving one to a young child.
  • Try not to scratch because broken skin can let bacteria in.

When Home Treatment Isn’t Enough

 Most poison ivy rashes clear up on their own. Visit the Walk-In Clinic if:

  • The rash is on your face, near your eyes or mouth, or on your genitals
  • The rash covers a large area of your body or is severely swollen
  • Blisters are oozing pus
  • You have a fever
  • Itching keeps you up at night despite home treatment
  • The rash isn’t improving after 2 to 3 weeks

Go to the Emergency Room right away if you have trouble breathing after being near burning brush. Inhaled urushiol smoke can be serious.