Why do people get rashes from lakes?

There are a few potential causes for rashes after swimming in lakes:

- Swimmer's itch: Swimmer's itch, also known as cercarial dermatitis, is a skin irritation caused by a parasitic flatworm called a schistosome. Schistosomes are found in freshwater lakes and rivers, and they can penetrate the skin of humans and other animals who come into contact with the water. The rash from swimmer's itch typically appears within a few days of exposure and can cause intense itching, redness, and swelling.

- Allergic reactions: Some people may experience an allergic reaction to the chemicals or other substances in lake water. These substances can include pollen, algae, bacteria, and sunscreen. Allergic reactions can cause a variety of symptoms, including rashes, itching, and difficulty breathing.

- Bacterial infections: Bacteria that are found in lake water can also cause skin infections, such as cellulitis and impetigo. These infections can cause a variety of symptoms, including rashes, fever, and pain.

- Sunburn: It's important to protect your skin from the sun when spending time at the lake, as sunburn can cause a rash-like appearance.

To prevent rashes after swimming in lakes, it's important to:

- Avoid swimming in areas where there are known outbreaks of swimmer's itch.

- Wear protective clothing, such as a rash guard or wetsuit, when swimming in lakes.

- Rinse off with fresh water after swimming.

- Apply sunscreen to protect your skin from the sun.

- Avoid contact with any plants or animals in the lake.

If you experience a rash after swimming in a lake, it's important to see a doctor to get a diagnosis and treatment.