- Not a true coral
- Categorized as calcareous hydrozoan
- Small brush-like growth on rocks and coral
- Initial: Stinging or burning pain
- Later: Severe itching and Urticaria
- Pain resolves in 90 minutes (earlier if treated)
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Urticaria flatten in 24 hours and resolve in 7 days
- May be hyperpigmented for up to 2 months
- Treat the same as Jellyfish stings