How long does chlorine rash last? How to clear up this common skin irritation. Then, you’ll be left with delayed hyperpigmentation at the former site of the jellyfish sting. Depending on the ...

They're tiny baby jellyfish, so small you can't even see ... About 4-24 hours later, you start to itch and sting. And you get a red rash that looks like acne and lasts about a week.