We just returned from AC and a few of us have a "rash" really more like bites that we got from diving/snorkeling. We were told the jellyfish were spawning and it was from the larva in the water. A friend suggested we put oil (or vaseline) on even under our suits..we did but still got some bites..MY question is has anyone heard of this..what is it really..They itch and spread especially if you scratch..