Poison ivy and poison oak are the most well known plants that can cause allergic contact dermatitis. They are easily identifiable, as they both contain three leaflets with notched edges. They are found as either shrubs or vines throughout all the United States.

Once the oil from either of these plants comes into contact with the skin, it does not spread and you can not catch poison ivy by touching someone's rash. It is possible, though, for it to spread if the oil remains under one's fingernails, on clothing or from contact with a pet's fur that has been in contact with the plant. The rash usually begins as red bumps and blisters that are very itchy and can last up to one to three weeks.

While the best approach to treatment is learning to avoid the plants, there are various options for treatment should exposure to the plants happen. Mild reactions can be treated with calamine lotion, hydrocortisone cream, an oral antihistamine, or cool soaks. More severe exposure will require prescription oral steroids or stronger topical steroid cream.

Central Drugs recommends the following formulations for Poison Ivy/Oak Treatment:

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