Dermatology

Skin Inflammation (Rashes)

Poison Ivy

Did You Know?

Scratching poison ivy blisters will not spread the rash. In addition, the poison ivy rash is not contagious -- only urushiol (oil found in the sap of poison ivy) can cause a reaction.

What is poison ivy?

Poison ivy is a type of Native American plant which causes an allergic skin reaction in almost 85 percent of people exposed to the plant. Two other plants, poison oak and poison sumac, are also often called poison ivy and have the same allergic effect.

What causes the allergic reaction?

The resin in the plants contains an oily substance called urushiol. Urushiol is easily transferred from the plants to other objects, including tools and animals. This chemical can remain active for more than a year. When a person touches this substance, either directly or indirectly, a reaction often occurs. In addition, when poison ivy is burned, the airborne urushiol particles may come in contact with your skin.

What are the symptoms of poison ivy?

The following are the most common symptoms of poison ivy. However, each individual may experience symptoms differently:

a contact dermatitis rash characterized by bumps and blisters that itch.
swelling in the area of contact sometimes occurs.
blisters that eventually break open, ooze, and then crust over

The symptoms of poison ivy may resemble other dermatologic conditions. Consult a physician for diagnosis.

Treatment for poison ivy:

Prevention is the key to avoiding a poison ivy reaction. However, if you are aware that you came into contact with the plant, wash the exposed area immediately. Also, wash your clothes and any other gear that came into contact with the plant. If a rash develops, treatment may include the following:

cool showers
over-the-counter anti-itching creams such as calamine lotion
oatmeal or baking soda baths
prescription cortisone (if the reaction is severe)

This page was last updated on: January 31, 2008.

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