Jellyfish
The inevitable result: Beach-goers stung by the hundreds, in the water and on the sand, San Diegan and Iowan alike - more than 200 per day for a while last year. Whether something similar happens again this summer remains to be seen. Those purple-striped jellies off Point Loma may not blow in toward land; the nettles might not show up.
Ref. https://www.signonsandiego.com/uniontrib/20..._1n21jelly.html
I think the best way to treat a jelly fish sting is to not get stung at all. Being aware of what is in the water around you can save you a lot of pain later on. Jelly fish are not something to mess with. Hot compresses for a hour does help but they are very painful from what I have heard.