Hello. I was also interested in knowing if the rash comes back. I was the one who ordered Ivy Off after seeing the recommendations from Lara's post on Lymph nodes. I checked over the website. Here's some information from the Ivy Off website:
"The oil spreads through the lymphatic system. The antigen then affixes itself in the skin and underlying tissue. The rash can pop up anywhere on your body. The antigen remains in your body and is carried by your lymphatic system and can continue to cause rashes in new areas for some time."