Many people get a rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants.
The itchy, blistering rash often does not start until 12 to 72 hours after you come into contact with the oil
Signs and Symptoms include:
- Itchy skin.
- Redness or red streaks.
- An outbreak of small or large blisters, often forming streaks or lines.
- Crusting skin (after blisters burst).
The rash is very itchy and can appear on any part of the body. The rash can continue to appear on new parts of the body when:
- Other parts of the body touch the oil.
- You spread the oil on your skin by touching other parts of your body.
The rash is not contagious and does not spread. It might seem to spread, but this is a delayed reaction.
Most people see the rash go away in a few weeks. If you have a serious reaction, you need to see a doctor right away. Swelling is a sign of a serious reaction — especially swelling that makes an eye swell shut or your face to swell.
If you have a serious reaction, you will likely need prescription medicine. Your dermatologist may prescribe a steroid ointment that you can apply to the skin. To treat a severe case, a strong medicine like prednisone may be necessary.
If you have an infection, your dermatologist may prescribe an antibiotic. You likely have an infection if you develop a fever or have pus, pain, swelling, and warmth around the rash.
If you are not sure what caused your rash, you should see a dermatologist. Rashes appear on the skin for many reasons.