Questions related to Swimming as an outdoor activity (lesser as a Sports), safety precautions and techniques about swimming, questions related costumes (not the product recommendation ones) are to be used with this tag.

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What's that stinging feeling when I swim in the sea?

When I swim in the sea around Singapore, I get stinging/prickling/electric sensations on my skin in certain areas of the water sometimes. There aren't any visible creatures nearby. What are these? ...