This is known as a blue bottle and sometimes they wash up on Australian beaches. What should you do if you get stung?
Great, you answered "Apply ice to the sting".
See here what other people have answered:
- Apply ice to the sting
- Apply topical heat to the sting of up to 45°C
- Immerse the sting in antiseptic
- Apply vinegar
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Interesting fact:
Blue bottles are not real jellyfish, but they are a colony of individual organisms that can sting humans. A sting from a bluebottle causes immediate inflammation of the skin which tends to look like a long line of spots. If the tentacles have stuck to your skin, carefully pick them off using gloves, taking care to avoid further stings. People report the pain as being severe, but which fades over an hour.