what to do if you think you have poison ivy?
['Apply an over-the-counter corticosteroid cream for the first few days.', 'Apply calamine lotion.', 'Take oral antihistamines, such as diphenhydramine (Benadryl, others), which may also help you sleep better.', 'Soak in a cool-water bath containing an oatmeal-based bath product (Aveeno).']