What is swimmer's itch?

Swimmer’s itch, also called cercarial dermatitis (sir-CARE-ee-uhl der-muh-TIGHT-iss), appears as a skin rash caused by an allergic reaction to certain parasites that infect some birds and mammals. These microscopic parasites are released from infected snails into fresh and salt water (such as lakes, ponds, and oceans.) While the parasite’s preferred host is the specific bird or mammal, if the parasite comes into contact with a simmer, it burrows into the skin causing and allergic reaction and rash. 

Swimmer’s itch is found throughout the world and is more frequent during summer months.

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1. What is swimmer's itch?
2. What are the signs of swimmer's itch?
3. Do I need to see my health care provider for treatment?
4. What can be done to reduce the risk of swimmer's itch?