Have you ever heard of this?
Copied and pasted from a survival blog submission:
•2 Pre-1982 US Pennies – These work great for soothing stings and bits. Don’t ask me how but with four kids, I can attest that this works. Just tape one over the bite or sting and leave it…
http://www.survivalblog.com/
It's currently near the top of the main page of survival blog. Do a search for sting to get there quickly. The info above is part of a long post about preparing a handy emergency kit.