I have very sensitive skin. Untreated with plantain, a mosquito bite will last for several weeks. This is unpleasant. To get a rash from poison ivy, I just need to turn my back and it spits the offending oils at me. This time I actually grabbed a leafless vine and got a small patch on the back of my right hand. Now it has spread secondary infections have popped up covering my belly, neck, and splotches on the opposite arm. after 13 days, I think the weeping blister phase is over so now I can work on healing the resulting rough shoe-leather feeling rashes. Yay for plantain/ mullein/ dock salve!