A poison ivy rash typically appears within 12 to 48 hours after exposure to the plant's oil (urushiol) and usually lasts about 2 to 3 weeks. For people who have never had a rash from poison ivy before, it may take longer-up to 3 weeks or more for the rash to fully clear. Those with prior exposure might see the rash resolve in 1 to 14 days. The rash goes through stages including itching, redness, blistering, and then crusting before healing
. In most cases, the rash will heal on its own within 1 to 3 weeks, with blisters drying up after about a week. Severe cases can last longer and may require medical treatment such as corticosteroids to reduce inflammation and speed recovery
. It is important to avoid scratching to prevent infection and to wash any clothing or items that may have come into contact with urushiol to avoid spreading the rash to new areas of the body
Summary:
- Rash onset: 12 to 48 hours after exposure
- Typical duration: 2 to 3 weeks
- First-time exposure: rash may last 3 weeks or longer
- Repeat exposure: rash may clear in 1 to 14 days
- Severe cases: may last longer, require treatment
- Rash is not contagious but can spread if urushiol oil remains on skin or objects
