THere seem to be two varieties of frog: a finegrained dotty one and a fat pillowy one. Mine is very puffy and pillowlike, and has very little sting to it. I've never had the other sort.
LadyFsu, I'd recommend holding your hand under running hot water, maybe rubbing it down with vinegar, and if it keeps swelling, maybe taking some Benedryl. You've got a serious allergic reaction there, even from a not-usually-serious source. If you get rapid heartbeat or throat swelling, call 911.
Once you sensitize yourself to marine stings, latex gloves are a very good idea.