Oh, dear. Hot hot water wash everything. It won’t keep erupting from one exposure, but if the urushiol is still on your shoes (can you wash them? If so, do.) it will re-expose you. If it has grown in your lawn, and gets regularly mowed, the urushiol is everywhere outside now. It has been very humid and somewhat breezy, the oil transfers that way, also. If you got scratched by a cut branch, the area around may continue to erupt. When you come in from outside, wash off all areas that touched anything with cool water and Dawn (another Dawn use!) Loud cursing will help to alleviate the itch. Good luck, Little Penguin, this just sucks.