The rash is an allergic reaction to the oils of the plant. This oil is released if the plant is damaged or bruised. The reaction may develop after frequent contact with the plants.
The oil may pass right onto the skin. It may also pass onto items such as clothes, tools or toys. The rash can occur after contact with these items. The oil on these items can cause a reaction years after first contact.
People may only develop a reaction after repeated contact with the plant. Contact with the oil is likely after:
Work or play in wooded areas during the spring, summer, and fall
Touch pets or animals that have come in contact with these plants
Handle clothes or objects that have come in contact with these plants
Being around smoke of these plants if they are burned
The oils cause a very itchy and red rash. It appears within 24 to 72 hours of contact with the oil. The rash may look streaked and have oozing blisters.
Some may have a severe reaction. Medical care should be sought for the following symptoms:
Swelling of the face or throat
Rash on the genitals
Swelling or rash that covers more than one–third of your body
Rapidly spreading rash
The doctor will look at the rash. It may be diagnosed based on appearance and possible contact.
The skin rash can cause discomfort. It will often pass on its own in 2 to 3 weeks.
Scratching can cause further damage to the skin. It can also increase the risk of infection. Treatment can help to ease itching. Steps may include:
Home care such as cool compresses with water or whole milk
Outsmarting poison ivy and its cousins. US Food & Drug Administration website. Available at: https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm049342.htm. Updated June 6, 2017. Accessed October 30, 2019.
Poison ivy, oak, and sumac: Who gets a rash, and is it contagious? American Academy of dermatology website. Available at: https://www.aad.org/itchy-skin/poison-ivy-oak-sumac-who-gets-contagious. Accessed October 30, 2019.
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