This is poison ivy (Toxicodendron radicans (L.) Kuntze ssp. radicans-the Wikipedia says it should be poison-ivy, with a hyphen). The plant is quite common here. Many people, including me, break out if they come in contact with it. When the leaves change color in the fall, this is one of our most beautiful plants.
I don't know what the reddish blisters (?) on some of the leaves are. I would guess a fungus, or the result of an insect infestation.
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