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"It can cause swimmer's itch, a red rash where it penetrates human skin. But it's not able to cause infection," Dillman said.

Dr Suárez diagnosed the migrant, and more than 20 others who arrived shortly afterwards, with cercarial dermatitis, also known as swimmer's itch.

She typically would shower after swimming there and others have told her they avoid it over “swimmer’s itch” concerns.

The rashes, known as “swimmer’s itch,” is an allergic reaction to parasites released by snails in fresh and salt water.

The Los Angeles Times reported Tuesday that the lifeguards were treated for “swimmer’s itch” - a condition caused by an allergic reaction to microscopic parasites.