Spreading red area or streak with fever.When to Call for Swimmer's Itch - Lakes and Oceans Call Doctor or Seek Care Now It also causes the rash and itching to become more severe. The more the exposures, the faster the rash occurs.For repeat contact, the onset of itching and rash is within 2 hours.After first-time contact, the onset of itching and rash takes 1 to 2 weeks.Each time the body is exposed, the more intense the reaction will be. Swimmer's itch is the body's allergic reaction to the parasite.Repeat Contact (Exposure) and the Body's Reaction Their normal life cycle involves birds and snails. The parasites get into the lakes from the droppings of water birds.It is less common in salt water (called clam digger's itch).In the US, Michigan and other Great Lakes region states are most involved. It is also found in lakes in Canada and over 30 other countries. This parasite can be found in lakes in every state (US).The rash and itching are the body's allergic reaction to parasites in the skin.It gets into the skin of humans by mistake. Swimmer's itch is caused by a very tiny parasite.The rash gradually fades away over 2 weeks. The spots can be quite itchy for up to 7 days.The spots turn into small red lumps over 1 or 2 days.The spots appear at sites where a parasite has gotten into the skin. Then small red spots appear within 1 or 2 hours.The first symptom is itching or burning of the skin.
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