Might try any combo of these:
Take some benadryl.
Hopefully you've rinsed off the rosin with strong soap.
Take a cold bath.
Try oatmeal paste (mix plain oatmeal with water and slather it on, let it dry, rinse off).
Right after it happens if you dump white vinegar on it, it'll take some of the sting away (and you'll smell like a salad). Vinegar worth a try too even after.
Try dumping the original brown type listerine on it if you've got any (not the colored stuff, the brown stuff-colored has sugar). Even the generic works as long as its brown.
Hand sanitizer may help (it's the alcohol in it) too, just don't
drown yourself in it!
Take Benadryl and go to bed

.
I'm allergic to pine, dust mites, and several other contact allergies. My dog is allergic to a bunch of stuff too, all of the
above remedies are things I do to both of us when the itching starts. Yes, you can give a dog benadryl (go by weight!).
Might want to wear long sleeves, two layers next time

. Good luck, hope the itching stops!