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Poison ivy, poison oak, and poison sumac are plants that can cause a skin rash called allergic contact dermatitis when they touch your skin. The red, uncomfortable, and itchy rash often shows up in lines or streaks and is marked by fluid-filled bumps (blisters) or large raised areas . It is the most common skin problem caused by contact with plants (plant dermatitis)
Allergic contact dermatitis (ACD) is a delayed type of induced sensitivity (allergy) resulting from cutaneous contact with a specific allergen to which the patient has developed a specific sensitivity. This allergic reaction causes inflammation of the skin manifested by varying degrees of erythema, edema, and vesiculation.
The term contact dermatitis sometimes is used incorrectly as a synonym for allergic contact dermatitis. Contact dermatitis is inflammation of the skin induced by chemicals that directly damage the skin and by specific sensitivity in the case of allergic contact dermatitis.

Treatment:

Topical corticosteroids are the mainstay of treatment, while a variety of symptomatic treatments can provide short-term relief of pruritus. However, the definitive treatment of allergic contact dermatitis is the identification and removal of any potential causal agents; otherwise, the patient is at increased risk for chronic or recurrent dermatitis. Online resources allow the physician to create a list of products free of allergens to which the patient is allergic.