Overview

Poison ivy, poison oak, and poison sumac are plants that can cause a skin rash upon contact. The red, itchy rash often shows up in lines or streaks. It may cause fluid-filled blisters or large, raised hives.

The rash is caused by an allergic reaction to an oil in these plants. The rash may occur when you touch the plant or when you touch objects that have come in contact with these plants. Common examples include clothing, pet fur, sporting gear, or gardening tools.

You can't catch or spread the rash by touching the rash or the blister fluid. The plant oil will already have been absorbed or washed off the skin. The rash may seem to be spreading because it's still developing from earlier contact or because you have touched something that still has the plant oil on it.

How can you care for yourself at home?

• If your doctor prescribed a cream, use it as directed. If your doctor prescribed medicine, take it exactly as prescribed. Call your doctor or nurse advice line if you think you are having a problem with your medicine.
• Use cold, wet cloths to reduce itching.
• Take warm or cool baths with oatmeal bath products, such as Aveeno.
• Keep cool, and stay out of the sun.
• Leave the rash open to the air.
• Wash all clothing or other things that may have come in contact with the plant oil.
• Avoid most lotions and ointments until the rash heals. Calamine lotion may help relieve symptoms of a plant rash. Use it 3 or 4 times a day.

To prevent exposure

The best way to prevent future rashes is to learn to identify these plants and avoid them.

• Use a cream or lotion to help prevent the plant oil from getting on your skin. These products are available over the counter.
  • Wear vinyl or leather gloves. Rubber (latex), cotton, or wool gloves offer no protection.
  • Wash well or throw away anything that came into contact with the plants.
• Be sure to wash your hands before and after you use the washroom.