- 1). Watch for classic poison ivy symptoms, such as itchiness, redness, swelling and blistering.
- 2). Check your skin to see if the rash forms a straight line. Depending on the way your skin came in contact with the plant, your rash might take the form of a straight line down your legs or arms.
- 3). Pay attention to when the rash developed. If you notice a rash within two days of trekking through a park or other wooded area, you might have poison ivy. Reactions to the oily resin in poison ivy typically develop 24 to 28 hours after exposure.
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