BOISE -- A warning about a popular Idaho swimming destination.

The Idaho Department of Fish and Game says some visitors have reported breaking out in rashes soon after swimming in Horsethief Reservoir -- located eight miles east of Cascade.

Fish and Game says nothing has not been confirmed, but believes the cause of the rashes is from something commonly known as swimmer's itch.

It's a parasite that can cause a raised, mildly itchy spot to develop on the skin, but it generally only lasts a week or so.

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