Can Poison Ivy Rash Spread?

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Can Poison Ivy Rash Spread?

Poison ivy rash is an allergic skin reaction caused by the sap oil of the poison ivy. You can identify it from the pictures below.

Poison Ivy leaves

The rash often begins after a 12 to 48 hours of the exposure. The result can range from mild red bumps to an intense allergic reaction of swelling, blistering, and oozing.


The rash will frequently break out in stages and continue spreading for the first 1 or 2 days. If new areas of rash appear after 3 days, you are probably get re-exposed to the plant oils. Because the oils can easily attach to your clothing, tools or even your pet’s fur. Besides, the oil can become vaporized if you put fire on the poison ivy, so inhaling the smoke also leads to the rash.

However, the rash is not contagious. Once the rash appears, the original oil has all gone into the victim’s skin, so it cannot pass to others. And the fluid in the blisters is not allergic and will not spread the rash.


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