Poison ivy,poison oak, andpoison sumacare plants that can cause arashif you come in contact with the urushiol oil found in them. Even when dried-up, their leaves and stems can cause arash. Here are a few things that may help you recognize them:
- Poison ivy:It can be a vine or shrub, and it can be found throughout most of the states except in Alaska and Hawaii. It grows in wooded areas, fields, on the roadside, and along riverbanks. It can also be found in urban areas, such as backyards or parks. Mostly, its leaves are arranged in a cluster of three leaflets (trifoliate).
- Poison oak:It grows more often as a shrub, although it can grow like a vine. It is found in the western United States and British Columbia. It also has a leaf arrangement (trifoliate) similar to that of poison ivy and may sometimes look like a true oak.
- Poison sumac:It can grow either as a shrub or small tree, and it is found in the eastern and southeastern United States. It grows preferably near watery or wet areas. Each stem of poison sumac contains 7-13 leaves arranged in pairs.
It is wise to research a bit about the presence of any of these plants in a wooded area where you have not been before but are planning to go there. This can help you take precautions (before leaving for there) such as covering your body completely or applying an ivy blocker (shield against the oil) on the exposed areas.
What does a poison ivy, oak, and sumac rash look like?
The urushiol oil present in the leaves, stems, and roots ofpoison ivy, oak, and sumacis the one that is responsible for the rash. Most people who touch any of these plants will experience the following:
- The rash appears wherever youitch.
- Most often, the rash is red andblistering.
- The rash itches so intensely that it can wake you while asleep.
- Theblisterstend to burst and leak the fluid.
- The rash usually appears within a few hours after contact with the plant if you tend to developallergicreactions. If you have not experienced the rash earlier, it may appear after two to three weeks.
How do you treat poison ivy, oak, and sumac rash?
Once you have come in contact with poison ivy, oak, or sumac plants, the first thing that you should do is rinse the affected skin thoroughly with lukewarm or soapy water. Here is what you can do to treat the rash at home:
- You can apply cool compresses to the skin.
- You can use topical treatments to relieveitchingsuch as oatmeal or baking soda bath,calamine lotion, and hydrocortisone cream.
- Oral pills ofantihistaminessuch ascetirizine,Benadryl(diphenhydramine),Zyrtec(cetirizine), orAllegra(fexofenadine) also help relieveitching.
- Take care to not scratch because scratching can cause an infection.
- 不要拿水泡,因为它能做什么呢the blisters open and expose the underlying skin to the germs.
- Wash your skin gently because scrubbing the skin makes the oil irritate the skin further.
If your rash does not show improvement in 7-10 days or becomes infected (filled with pus and painful on touch), you should consult a board-certified dermatologist who can prescribe medications for the same.
How long does a poison ivy, oak, and sumac rash last?
The rash frompoison ivy, oak, and sumaccan be extremelyitchyuntil it clears completely. How long your rash will last depends on whether you’ve had a rash from one of these plants before. If you have
- A history of rash from poison ivy, oak, or sumac, the rash lasts for 1-14 days before clearing up on its own.
- Never had a rash from poison ivy, oak, or sumac, you can have a rash for 21 days or longer before it disappears.
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American Academy of Dermatology Association. Poison Ivy, Oak, and Sumac. Available at: https://www.aad.org/public/everyday-care/itchy-skin/poison-ivy
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