|It says on the treatments bourd: "About 15 percent of the 120 million Americans who are allergic to poison oak, poison ivy, and poison sumac are so highly sensitive that they break out in a rash and begin to swell in 4 to 12 hours instead of the normal 24 to 48. Their eyes may swell shut and blisters may erupt on their skin. This is one of the few true emergencies in dermatolgy says William L. Epstein, MD. Get to a hosipital as soon as possible. A shot of corticosteroids will bring the swelling down."
You should go to a dermatologist or even a hospital right away. He'll tell you if it's poison ivy or something else.