The rash caused by a jellyfish sting is often red and swollen, and it may even bleed.
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Jellyfish Stings, First Aid 

Picture of Jellyfish Stings, First Aid: The rash caused by a jellyfish sting is often red and swollen, and it may even bleed. Divider line
The rash caused by a jellyfish sting is often red and swollen, and it may even bleed.
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Who's At Risk
Stings from jellyfish most often occur in salt water, while swimming or wading, when a person accidentally comes into contact with the jellyfish. Stings from some jellyfish may also occur if a person comes into contact with jellyfish that have washed onto the beach or detached tentacles in the water. Certain jellyfish tentacles that have become detached are still capable of causing stings for 2 weeks or more. Jellyfish stings sometimes occur in fresh water as well.
Last Modified: 22 Dec 2008