Sea anemone dermatitis

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Sea anemone dermatitis is a skin irritation that happens after touching certain sea anemones. Like jellyfish stings, it comes from tiny stinging cells called nematocysts that inject toxin into the skin. How deeply they sting depends on the anemone species. Even baby forms of the anemone (larvae) floating in the water can irritate skin, and can affect areas under swimwear.

Who is at risk: swimmers, water skiers, jet skiers, people driving small boats, clam diggers, and others who spend time in shallow water where these anemones live. The condition can affect people of all ages. The sea anemone Haloclava producta has been linked to dermatitis in clammers off Long Island, New York. To help prevent it, cover the legs to avoid contact with sand or water.

Symptoms: usually start at least 12 hours after contact. Common signs are itching and a stinging sensation. Swelling or harmed skin (necrosis) can occur. In rare cases, more severe problems such as kidney issues can develop. Most cases are mild and heal within about a week. People with asthma or allergies may have more severe symptoms on average.