Poison ivy plants contain an oily substance called urushiol, which is what causes itching and other symptoms after exposure. Approximately half of people exposed to this substance develop the itchy rash characteristic of poison ivy exposure. If you have redness, swelling, itching, or blisters, one of our experienced providers will examine the rash and make a diagnosis. We can also prescribe corticosteroids or other medications to reduce discomfort and keep the symptoms under control. It is especially important to seek treatment if you have a widespread rash especially on the face, the blisters are oozing, or the rash does not improve within one week.