DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Jellyfish sting on hand. Some species of jellyfish have nematocysts (stinging cells) on their tentacles that inject painful, burning venom into the skin. Most stings are mild and don't require treatment. In extreme cases, a sting may cause difficulty breathing or chest pain, in which case urgent medical attention is required.
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