Swimmer’s itch is a common problem for people who swim in lakes and ponds during summer months. A small worm called a "fluke" burrows under the skin, creating itchy lesions.
- What is Swimmers' Itch and How Can I Avoid It?
Swimmer's itch is common around Minnesota's lakes in midsummer. Red, itchy welts appear on your skin within several hours of leaving the water. It may last a few days to several weeks, depending on your sensitivity. University of Minnesota Extension Service. Attention: Non-MDH link