Sea bather’s eruption, commonly referred to as sea lice rash, is a skin irritation caused by the larvae of certain jellyfish, which become trapped under swimsuits and sting the skin. These microscopic larvae thrive near shorelines and are especially prevalent in warm coastal waters during summer months. When the larvae contact skin covered by tight swimsuits, they release venom causing red, itchy rashes that can persist for days or even weeks if untreated. To protect yourself from sea bather’s eruption, it is important to remove your swimsuit promptly after leaving the water and rinse your skin thoroughly with fresh water. This helps wash away any lingering larvae that might cause irritation. Wearing loose-fitting swimwear may also reduce the risk by limiting skin contact with trapped larvae. Some swimmers find that applying waterproof barrier creams before entering the water adds an extra layer of defense. When a rash appears, over-the-counter (OTC) steroid creams applied twice daily can soothe inflammation and speed healing. Non-drowsy antihistamines such as Allegra, Zyrtec, or Claritin are recommended to control itching and allergic reactions without causing sedation, making them more suitable for daytime use compared to Benadryl. Severe or persistent reactions should prompt consultation with a dermatologist for tailored care. Understanding the cause of this rash helps clear misconceptions surrounding “sea lice,” which are actually jellyfish larvae rather than insects or parasites. By following these practical prevention steps and treatments, beachgoers can enjoy worry-free time in the sun and surf while protecting their skin health. Remember to stay vigilant, protect your skin, and respond promptly to symptoms to keep summer days safe and fun.