A jellyfish sting can produce an allergic reaction similar to a bee sting, so if there are any immediate signs of an allergic reaction, such as difficulty breathing or hives, head to the nearest emergency room or call 911.
Small children that are stung over a large area of skin should go to the hospital, Shepherd said, as should people with stings that go on to become infected.
To prevent stings altogether, there is at least one lotion available in the United States that protects against jellyfish and other stinging marine life. If applied before going in the water, the lotion, Safesea, can help minimize the pain associated with stings.
Safesea's key ingredient is the same protective chemical that makes clown fish resistant to jellyfish stings. Auerbach, who was involved in designing clinical trials of the lotion and has part ownership in the company that makes the lotion, said the lotion has been shown to be safe and effective.
But the question still lingers, if no vinegar is in sight is urine better than nothing? While studies haven't proven it, Auerbach admits he's known a few people who said urine worked for them.