You need to keep "tecnu" outdoor skin cleaner, by "oak-n-ivy" in your vest pocket - you can use it in the field to remove the oil fron the poison ivy (or oak or sumac) and you won't even break-out! . This is great stuff carried by wildland firefighters. In your case now, use "oak-n-ivy" "CalaGel" it's great stuff available at most drugstores - it will relieve the itch and start to dry up the blisters. I'm using it now - even as I type! Good Luck!