The only exposed areas were my face, neck and hands. I put a generous amount of Safe Sea on my neck, and that's the area that was most affected. I didn't apply it to my face or ears, and I got one sting on my face and one on an earlobe. We were at Anthony's Key Resort on the north side but did a few dives on the south side as well (Mary's Place, of course). I saw thimble jellies in the water on our north and west end dives.