Sea bather's eruption
Sea bather’s eruption is an itchy rash caused by the stings of thimble jellyfish and certain sea anemones. As these organisms are very small they can get trapped in bathing suits, particularly around the groin and breast areas, and cuffs of wetsuits. Sea bather’s eruption is more common in summer when the water is warmer.
Symptoms of sea bather's eruption
The organisms often cause a tingling sensation under the bathing suit while in the water. This develops into an itch over several hours.
The rash usually starts a couple of hours after swimming. It typically lasts for 1 to 2 weeks, but may continue for 1 to 2 months.
Around 1 in 5 people also feel unwell with fever and fatigue. Tamariki may develop tummy upsets.
If you experience symptoms:
- change out of swimwear as soon as possible after coming out of the water
- shower to wash off any jellyfish that may still be attached to the skin.
If the symptoms are severe:
- contact your usual healthcare provider
- call Healthline on 0800 611 116
Diagnosing sea bather's eruption
If you think you have sea bather's eruption, visit your healthcare provider or pharmacy.
Treating sea bather's eruption
You can visit a pharmacy if you need topical treatments to help ease any pain or severe itchiness.
Preventing sea bather's eruption
To reduce the risk of sea bather’s eruption avoid sitting in shallow sea water for extended periods of time. This is this is where these kinds of jellyfish are likely to gather.
Stinging cells may still be in your costume even after it has dried out. You should machine wash your swimwear before wearing it again. Or you can rinse it in alcohol or vinegar, then wash it by hand with soap and water.