![]() So it’s helpful to note when and where your rash started. Your healthcare provider will make the diagnosis based on your symptoms. And you can’t see the larva that burrow under the skin. There’s no specific test to diagnose swimmer’s itch. Because swimmer’s itch is an allergic reaction, the rash can be more severe every time you get get it again.ġ of 6 How do you diagnose swimmer's itch? This rash tends to be very itchy for about 1 week before it starts to get better. Over the course of the first 24 hours, the rash can become very itchy. People experience mild itchiness and may notice some small, raised bumps. The symptoms of swimmer's itch usually start within 1 hour of swimming. Once under the skin, your body can react to the larva and cause itching. This microscopic larva does not cause an infection in humans, but it can burrow under skin. The infected snails release the larval form of the parasite (the “baby” stage, right after eggs hatch) into the water. The parasite infects snails that often live in shallow freshwater, like lakes and ponds. Swimmer’s itch is an allergic reaction to a parasite that can live in freshwater. We’ll explain how it happens and what you can do to treat it. And the itching can last for up to 1 week after a quick dip. This parasite does not cause an infection, but it can be quite uncomfortable and bothersome. It generally happens in freshwater, but it can occasionally happen in salt water. So, it's very important to try to prevent recurrences.Swimmer’s itch (cercarial dermatitis) is an itchy rash that can happen after swimming in natural bodies of water.
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