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Poison Ivy, Oak, and Sumac
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Skin Hair Nails

Poison Ivy, Oak, and Sumac

Exposure to the oily sap found in poison ivy, oak, and sumac can cause blistering skin rashes, requiring immediate preventative action and proper care.

Overview

Most people are sensitive to the oily sap found in the roots, stems, leaves, and fruit of poison ivy, poison oak, and poison sumac. If this sap contacts the skin, it causes a blistering rash that can range from mild to severe, depending on the level of exposure and individual sensitivity.

Risks of Exposure

Problems can also occur if these plants are burned. Airborne soot coated in sap can enter the respiratory system, eyes, nose, and throat.

Prevention and Treatment

The most effective way to avoid a rash is to learn to identify these plants and avoid contact. If you do come into contact with them, follow these steps:

  • Wash your skin and clothing immediately.
  • Consult a pharmacist regarding over-the-counter medicines if a rash develops.
  • See a doctor for severe rashes.

Frequently Asked Questions

Burning poison ivy, oak, or sumac is extremely dangerous because the urushiol oil becomes airborne in the smoke. Inhaling this smoke can cause severe respiratory problems, including lung irritation, difficulty breathing, and a rash inside the airways. It can also cause a rash on the skin, eyes, and mucous membranes. Never burn these plants. If you must dispose of them, wear protective clothing, gloves, and eye protection, and bag them for disposal according to local regulations.
Poison ivy typically grows as a vine or shrub with leaves in clusters of three, often described as "leaves of three, let it be." Poison oak also has leaves in clusters of three, but they are more lobed or rounded, resembling oak leaves, and can grow as a shrub or small tree. Poison sumac grows as a shrub or small tree, usually in wet areas, with 7-13 smooth-edged leaflets arranged in pairs along a central stem, with a single leaflet at the end. All three plants can have reddish stems and may produce berries that are white, yellow, or green.
If you suspect contact, immediately wash the affected skin thoroughly with soap and cool water for at least 10-15 minutes. The goal is to remove the oily sap (urushiol) before it can penetrate the skin. Also, wash any clothing, tools, or pets that may have come into contact with the plant, as the oil can remain active on surfaces for a long time and cause secondary exposure.
You should see a doctor if the rash covers a large area of your body, especially your face or genitals, or if it's accompanied by severe swelling, difficulty breathing, or signs of infection (pus, fever, increasing pain). Also seek medical attention if the rash doesn't improve within a week to 10 days with over-the-counter remedies, or if the itching is so intense it disrupts sleep or daily activities.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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