How long does poison ivy last?
Last updated September 3, 2026.
A poison ivy rash typically lasts 1 to 3 weeks, with itching peaking in the first days - and it is not contagious: blister fluid contains no urushiol oil and cannot spread the rash. New patches are usually slower-reacting skin, not spreading. The real spreader is leftover oil on clothes, shoes, tools, pet fur, and under fingernails - wash all of it. Treatment: cool showers, cold compresses, calamine, oral antihistamines for itch; severe, facial, or genital cases may need prescription steroids. See a doctor for face or genital involvement, large areas, fever, or any breathing trouble - burning poison ivy smoke is dangerous inhaled. Pymander is a free AI doctor, 24/7 by text, and can help you manage the itch.
What to do
- Wash everything that touched the plant: clothes, tools, shoes, pet fur, and under your nails.
- Cool the itch, do not scratch it: compresses, calamine, antihistamines - scratching infects.
- Stop blaming the blisters: the fluid does not spread the rash; residual oil does.
- Get seen for face, genitals, large areas, or fever: steroids beat suffering there.
Related questions
- How to treat contact dermatitis?
- When is a rash an emergency?
- What causes itchy skin all over?
- What does a tick bite look like?