I imagine Plantain would also work and it is a handy plant too (grows most everywhere). Plantain is an astrigent (which means it PULLS poisons, stings, ouchies, etc OUT of the skin). Just chew it up and splat it on.
http://simplykristen.com/?p=398

We had plenty of stinging nettle in the woods where I lived in Washington state. I learned at a wildlife park there that the “slime” from a slug will numb the pain if you are “stung” by nettle. Not the most enjoyable event, or solution, but if you’re out hiking in an area like that and get stung, grab the next slug you can find and rub ‘em on the painful area(s).