Poison ivy, oak, or sumac is found in every state except Alaska and Hawaii.
The invisible oily resin called urushiol causes the ill effects of these poisonous plants.
After making contact, the reaction (called dermatitis) may include a rash followed by bumps and blisters that itch. Scratching does not spread the outbreak but may cause infection because it allows bacteria from dirt on the hands to enter the skin.
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