Swimmer’s itch is a dermatitis that develops on exposed areas of the skin after contact with waters containing cercaria (larval forms) of avian schistosomes (parasitic flatworms). These parasites are released from infected snails (usually mud snails) into the water. While the parasite’s preferred host is waterfowl, if the parasite comes in contact with a swimmer, it burrows into the skin and causes an allergic reaction. Swimmer’s itch is found worldwide and is more common in summer months.
For further information on swimmer’s itch, please visit:
https://www.cdc.gov/swimmers-itch/about