The Truth about Poison Ivy
While poison ivy is around all year long, it really flourishes in the spring and summer months because the plant is growing well and people spend more time outside, increasing the rate of exposure. Poison ivy can be found not only in wooded areas, but also quite often in your own yard.
The majority of people have some sensitivity or allergy to poison ivy. If you have a history of allergies, you may be even more sensitive. The rash from poison ivy is caused by oil from the plant. While simple contact with poison ivy may lead to contamination with this oil, the exposure noticeably increases when the leaves and stems are crushed, for instance when clearing an area of weeds.
This highly irritant oil causes an allergic type of contact dermatitis, and the very itchy rash typically begins about a day after the skin comes into contact with the oil. If you know you have been exposed to poison ivy, it is important to wash your exposed skin with soap and water – several times – to prevent the oil from starting the allergic reaction. Also, if you suspect you have touched poison ivy, you should not rub your eyes or other sensitive parts of the body (such as when using the restroom) before you have washed several times. The oil on your fingers can easily be transferred to another site and start the allergic reaction. The rash caused by this allergic reaction can take up to 4-6 weeks to subside!
Sometimes, you don’t need to directly handle the poison ivy plant for it to cause an allergic response. First, never burn poison ivy. While the fire consumes the plant, the oil is carried on the smoke and can contaminate any surface it contacts. As the oil can be potent for up to five years, you can be exposed to it without ever seeing it! Smoke laden with poison ivy can also be quite dangerous. If it is inhaled into the lung in a person who is very allergic, the resulting allergic response can cause very serious respiratory inflammation and distress. Secondly, if a lawnmower runs over a patch of poison ivy, it will cut up and spew the oil over a wide area – not a good idea!
Once the allergic reaction has been started, the body’s response system takes over and there is nothing you can do to stop it. The rash will appear and the itching will start. At that point, treatment is directed toward making sure the oil has been washed off all parts of the body and controlling the itching with over the counter anti-itch medications and lotions. If the reaction is severe, such as extensive areas of the body covered with rash or swollen eyes, you should seek medical attention. The doctor may prescribe steroids, which will not stop the allergic reaction, but will reduce its effect.
Charles A. Welborn, MD, MPH, FAAP, FACEP, Medical Director, After Hours Pediatrics Urgent Care
March 8th, 2012
Carol



















