Tuesday, July 13, 2010

About Allergies: Poison Oak, Poison Ivy and Poison Sumac

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From Daniel More, MD, your Guide to Allergies
Plants from the Toxicodendron family are the most common cause of allergic contact dermatitis, and include poison ivy, poison oak and poison sumac. Coming into contact with these plants can cause a rash consisting of a linear, or streak-like, group of itchy blisters or bumps. The chemicals released from the plants, called urushiols, cause the itchy rash. Urushiol can be carried on the fur of animals, garden tools, sports equipment and clothing. The smoke from burning Toxicodendron leaves can also carry urushiol, and can result in inflammation in the lungs if inhaled. Patch testing is not necessary for Toxicodendron plants, since most people would have a positive test and the diagnosis is made clinically. Treatment involves avoidance of exposure to these plants, and the use of topical steroids to reduce the rash and itching.

Is There a Cure for Poison Oak Allergy?
Urushiol, oil found on poison oak leaves, causes allergic contact dermatitis, which is not caused by allergic antibodies like true allergic reactions. Therefore, allergy shots...

Food Allergies and Poison Oak and Ivy
Allergic reactions can occur with any food, but mangoes are unique in that they belong to the plant family that also contains poison oak, poison ivy and poison sumac. Contact with the skin from mangoes, such as with eating a mango like an apple, can result in contact dermatitis around the mouth.

Other Common Causes of Contact Dermatitis
Along with the evaluation for contact dermatitis, which includes patch testing, a person's history of exposure to various chemicals can help to determine the cause of the rash. The most common patch test performed in the United States is the TRUE test, and is the only test FDA approved for the diagnosis of contact dermatitis.



 


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This newsletter is written by:
Daniel More, MD
Allergies Guide
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