When you're swimming around docks, be careful not to get too close to the posts or ropes hanging in the water. Those little stinging thingys are in those mossy growths.I like ammonia diluted 1 part ammonia to 4 parts water for stings and insect bites.I was stung once with a box jellyfish---vinegar didn't do a thing, tried Windex and got some relief!
yeah i was spearing around my dock, probably the issue

AC