You may take cool showers and apply an over-the-counter lotion - such as calamine lotion - to help relieve the itch. How Are Allergic Reactions to Poison Plants Treated?Īn allergic reaction to a poison plant cannot be cured, but the symptoms can be treated. How Are Allergies to Poison Plants Diagnosed?Īn allergy to a poison plant is diagnosed based on the typical pattern of symptoms and the appearance of the rash. Cases of poison plant allergy occur most frequently during the spring, summer, and early fall when people spend more time outdoors. For those who are less sensitive, exposure to a large amount of urushiol is necessary before a reaction develops. Some people are very sensitive and will have a quick reaction upon contact with a small amount of urushiol. Some experts estimate that three out of four people are sensitive to the chemical found in these plants, although the degree of sensitivity varies. Poison ivy, poison oak, and poison sumac are three of the most common causes of allergic contact dermatitis in North America. The rash develops into red bumps, called papules, or large, oozing blisters.A rash erupts on the skin, often in a pattern of streaks or patches from where the plant has come into contact with the skin.
Symptoms generally occur in the following phases: The symptoms of a poison plant reaction are similar, because they all contain the same chemical, urushiol. Poison sumac is more common in wet, swampy areas. Harmless sumac has red, upright berry clusters. Poison sumac can be distinguished from harmless sumac by its drooping clusters of green berries. Poison sumac grows as a woody shrub, with each stem containing 7 to 13 leaves arranged in pairs. Poison oak is more common in the western U.S. The undersides of the leaves are always a much lighter green than the surface and are covered with hair. Poison oak closely resembles poison ivy, although it is usually more shrub-like, and its leaves are shaped somewhat like oak leaves. In the northern and western U.S., and around the Great Lakes, it grows as a shrub. In some areas of the country (East, Midwest, and South), poison ivy grows as a vine. Poison ivy, poison oak, and poison sumac can be found in most areas of the U.S., except Alaska, Hawaii, and the deserts of the Southwest.
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This sensitizes the skin so that new contact with urushiol causes an allergic reaction. The immune system then prepares a defensive reaction for the next time the skin encounters the substance. However, it's common for no visible reaction will occur the first time a person comes in contact with a poison plant. When initially exposed to urushiol, the skin alerts the immune system of the presence of the irritating chemical.
Sensitivity builds up after the skin is exposed to the substance.
( Dermatitis is swelling and irritation of the skin.) Skin is not automatically sensitive to urushiol. The rash that results from the poison plants is a form of allergic contact dermatitis. Inhaled urushiol can cause a very serious allergic reaction. The smoke may expose not only the skin to the chemical but also the nasal passages, throat, and lungs. It can also be inhaled if the poison plants are burned. Urushiol is absorbed quickly into the skin. Urushiol is found in all parts of these plants, including the leaves, stems, and roots, and is even present after the plant has died.
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