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| FAQ's About Poison Oak, Ivy
and Sumac |
What causes poison ivy, oak and sumac
rash?
It all boils down to the skin’s reaction to a nasty
little oil called urushiol (ooh-roo-she-all). Urushiol is a toxic,
resinous type substance that is found in all parts of the poison ivy,
oak and sumac plants. When urushiol gets on the skin it binds to the
skin within 10-20 minutes. At that point the urushiol becomes extremely
difficult, if not impossible, to get off the skin with soap and water.
The rash from poison ivy, oak and sumac is the body’s natural reaction
to the toxin. Contact with this annoying oil produces a rash in three
out of four people. The rash can begin within a few hours after contact,
or it can start three to five days later. |
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Where do poison oak, poison ivy and poison sumac
plants grow?
Poison oak, poison ivy, poison sumac and other
members of the Rhus family grow in all portions of the North
American continent (except Nevada, Alaska, and Hawaii) at elevations
below 4,000 feet with a rainfall above eight inches per year.
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What does a poison oak or poison ivy rash look like?
The rash starts with itchiness and swelling, followed
by a reddish inflammation of tiny pimples. Blisters form and couple
in a chain-like reaction, and a clear fluid oozes from the blisters.
This fluid then hardens to a yellowish crust. Left untreated, the
rash (a typical histamine response) will last three to five weeks.
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What can I do to relieve the itching
from poison oak or poison ivy?
There is no cure for the poison oak or poison ivy rash
once it begins, only relief of the symptoms. Avoid further contact with
the plant oil if possible. Be sure to wash the area with Tecnu® Outdoor
Skin Cleanser or Tecnu Extreme™ Poison Ivy Scrub. Clean your tools,
clothing and pets that have been exposed to the poison oak, ivy or sumac
with Tecnu to avoid recontamination from the urushiol oil. Minor
itching, pain, oozing and swelling caused by poison oak and poison ivy
can be relieved with over-the-counter anti-itch treatments such as Tecnu
Rash Relief™ spray, Calagel® medicated anti-itch gel or Corticool® 1%
hydrocortisone gel. In severe cases, a physician can prescribe
antihistamine creams, tablets or shots. |
Do the blisters cause the rash to
spread?
No, the blisters are the body’s natural allergic reaction
to poison ivy, oak and sumac plants. If the blisters break and ooze, the
fluid does not contain the oil that causes spreading. Oil from the
original contact with poison oak and poison ivy will continue spreading
(unless removed) for the first 1 or two days. If new areas of rash
appear after three days, you are most likely getting re-exposed to the
plant oil from contaminated clothing, tools or even your cat or dog. |
How long will a poison oak or poison
ivy rash last?
Mild cases of poison oak or poison ivy can last five to
12 days. More severe cases can last 30 days or longer. |
Can I get the rash from someone else?
Generally speaking, no. Once the rash appears (i.e.,
within 1-3 days), the original oil has all bonded to the skin, so it
can't be spread to others. |
Should I break the blisters?
Never break the blisters! An open blister can easily
become infected and lead to blood poisoning. If the blisters break,
cover loosely with a sterile bandage. In severe cases, contact your
doctor. |
I've never had the rash before. Can I
get it now?
Yes, you can begin getting the rash at any time during
your life. Three out of four people are sensitive to poison oak and
poison ivy. Sensitivity is just a matter of being exposed enough times
until the body has an allergic reaction to the poison oil. |
Should I wrap or cover the rash with
bandages?
Air is helpful to healing any wound. If you cover the
rash with a sterile bandage, cover loosely to allow oxygen to reach the
surface of the skin. It is important to keep the rash very clean;
changing the sterile bandage frequently reduces the risk of infection.
Seek medical attention if the rash becomes red, feverish, or shows other
signs of infection. |
Are dead poison oak or poison ivy
plants safe to touch?
No, the poison oil remains toxic and does not evaporate.
All parts of living or dead poison ivy, oak and sumac plants, including
the roots, contain the urushiol oil. Be especially careful of dead
poison oak and poison ivy vines on firewood and leafless vines in the
winter. |
Do I need to clean urushiol oil from
clothing and tools?
Yes. The urushiol oil from poison oak and poison ivy
plants will remain on these articles and can cause a rash months, or
even years, later. Removal of the oil with Tecnu® Outdoor Skin Cleanser
is important to avoid contaminating through secondary contact in the
future. |
Can I get the rash from my pets?
Yes. Since animals’ fur protects their skin from the
urushiol oil, they typically don’t develop a rash. However, the oil will
remain on their fur and may contaminate you when you touch them. Tecnu®
Outdoor Skin Cleanser is safe to use on your pets to remove the oil from
their fur. |
Is it possible to get a rash by
breathing the smoke of burning poison oak or poison ivy plants?
Yes. Urushiol can be carried in the smoke from burning
leaves or brush. If you think you have inhaled the oils, see your
physician immediately; this can be a very serious condition. In several
states it is illegal to burn poisonous plants. Never burn them! Avoid
breathing the smoke. |
Does bleach remove the urushiol oil or
help heal the rash?
No. Bleach may appear to be a quick fix to a poison oak
or poison ivy rash. However, bleach removes the top layer(s) of your
skin. Using it can irritate your skin and in the process weaken it so
that the rash may become worse, or it could lead to an infection. Your
skin may then become more sensitive to getting the rash in the future. |
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PLANT IDENTIFICATION |
| Poison Oak: The leaves of poison oak are similar
to those of an oak tree, and grow in groups of three. It has white/green
flowers and berries. Poison oak grows as a shrub and is common on the
west coast of North America from Mexico to British Columbia. |
 |
| Poison Ivy: The plant has shiny leaves, small
yellow/green flowers and green/white berries. It grows as a vine, shrub
or bush. It is common throughout the United States, except in some parts
of the desert southwest, Alaska and Hawaii. The leaves of poison ivy
grow in groups of three. |
 |
| Poison Sumac: The leaves of poison sumac grow in
pairs; often 7-13 pairs on a stem with a single leaflet on the top.
Poison sumac produces yellow/green flowers and white/green berries. The
non-poisonous variety produces red-berries. Poison sumac grows as a
shrub or tree and is common in the eastern United States and along the
Mississippi River. |
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