· Learn how to identify and treat poison oak rash, an allergic reaction to the oil from the plant. See photos of rash stages, home remedies, medications, and when to seek medical help. · Most people are sensitive to the oil in poison oak. Usually, an itchy, red rash will appear that can take weeks to clear up. Learn more about how to identify a poison oak rash and how to treat it. View all This article explains what a rash caused by poison ivy, oak and sumac looks like. Learn how to identify and avoid poisonous plants that cause an itchy skin rash. Find out how to treat and prevent poison ivy, oak and sumac rashes with OTC medications and home remedies. Poison ivy, oak, and sumac are plants that commonly cause an allergic skin reaction. This is also called an allergic contact dermatitis. The result is most often an itchy, red rash with bumps or blisters. · In this article, we’ll cover what poison oak looks like, how it spreads, and most importantly, how to soothe the rash and support healing from the comfort of home. · Learn how to spot poison oak, tell the difference between poison oak and poison ivy, and treat a poison oakrash. What is the Difference Between Poison Oak and Poison Ivy? Poison oak is a relative of poison ivy. There are many similarities: · Most people are sensitive to the oil in poison oak. Usually, an itchy, red rash will appear that can take weeks to clear up. Learn more about how to identify a poison oak rash and how to treat it. This article explains what a rash caused by poison ivy, oak and sumac looks like. Learn how to identify and avoid poisonous plants that cause an itchy skin rash. Find out how to treat and prevent poison ivy, oak and sumac rashes with OTC medications and home remedies. Poison ivy, oak, and sumac are plants that commonly cause an allergic skin reaction. This is also called an allergic contact dermatitis. The result is most often an itchy, red rash with bumps or blisters. · In this article, we’ll cover what poison oak looks like, how it spreads, and most importantly, how to soothe the rash and support healing from the comfort of home. · Learn how to spot poison oak, tell the difference between poison oak and poison ivy, and treat a poison oakrash. What is the Difference Between Poison Oak and Poison Ivy? Poison oak is a relative of poison ivy. There are many similarities: