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If you've never received a rash from poison oak, ivy or sumac, the rash could last 21 days or longer. If you have had the rash previously, it will last one to 14 days.

Poison ivy leaves turn reddish in the spring, green in the summer and yellow, orange or red in the fall. It grows in the Eastern U.S. as a shrub or a vine, which is hairy and ropelike.

“No, you can not get poison ivy from someone else, and no, you can not spread it between other parts of your body on yourself," Dr. James said. "You have to have contact with the oil.

Poison ivy was found to have high variation across America. However, a small but noticeable uptick in leaf serration was discovered in samples taken from further west.