Medically reviewed by William Truswell, MD Sea lice bites are an itchy rash caused by jellyfish larvae that get trapped in swimsuits after swimming in the ocean. The larvae release toxins that trigger ...

And you get a red rash that looks like acne and lasts about a week. Here's how to avoid sea lice: Wear just your bathing suit. Fewer clothes means fewer places for them to get trapped. Actually ...