(Itchy rash that starts within 2 hours of being in a lake or ocean) Care Advice: apply an antibiotic ointment 3 times per day until seen. Scab that looks infected (drains pus or gets bigger).Severe itching not better after 24 hours of using steroid cream.Severe past allergic reaction to lake swimming that needed oral steroids.Spreading red area or streak, but no fever.Spreading red area or streak that's very large.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.
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