Eagle, we've got poison ivy all over our property simply because the house sets in the woods.

One year (while I was still working) I got the rash from poison ivy on each inner thigh. I'd scoot myself under my desk to itch the rash through my panty hose. It was so severe that my skin turned purple where I had itched it. The ladies at work had fun teasing me about how I got it there. The best I can figure is that while digging up some wild violets I touched the poison ivy roots then scratched a mosquito bite with that hand. The weird part is that I can go into my gardens and pull out any poison ivy in late winter or early spring and have no reaction to it all. Of course I always wear protective gloves.

Sumac is very poisonous and also will give most people a skin reaction.