Every year, more than a million people in the United States experience painful after-effects from contact with poison ivy, poison oak, and poison sumac. These plants all contain allergens that produce severe allergic skin reactions in most people. The allergens are present in the plant sap, which is found in the leaves, roots, stems, pollen, and flowers. The danger of skin reaction is greatest in the spring and summer, when the sap is most abundant. Allergens can be spread by direct contact with the plant, by dogs or other animals; by contaminated clothing, tools, or sports equipment; by smoke from burning plants; or by ingestion of the fruit buds.

What are the symptoms?

The first symptoms are itching and burning of the skin. Blisters usually develop in the skin and may remain for several days. Secondary infections can develop if the blisters are broken.

How can I treat it?

There is a preventative cream, Ivy Block, that you can buy over-the-counter and apply before you think you may be around areas with poisonous weeds to protect your skin. There is also a product named Ivy Dry that you can use after contact with the plants to remove the oils from the skin. After exposure, take a bath or shower to remove the allergens from the skin. Clean any clothes and other items that are contaminated with hot, soapy water. You can use topical creams to reduce the itching- Caladryl, Calamine, or cortisone-containing lotions. If the itching persists you can also take an oral antihistamine, such as Benadryl. Antihistamines have a sedating effect, so you may need to take them at bedtime.

When do I need to see my health-care provider?

If the skin has open blisters and appears irritated, red and inflamed, you may have a secondary infection and need to take oral antibiotics. If the effected area is widespread, rapidly progresses or has significant swelling you may need prescribed oral steroids. In any of these cases, consult your health-care provider.

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