Swimmer’s Itch: A Little Freshwater Wildlife to Be Aware of
Our lake is a natural freshwater environment, and at this time of year it is particularly full of life. Most of that wildlife goes unnoticed, but occasionally it can cause a temporary skin reaction known as swimmer’s itch, or cercarial dermatitis.
There is no need to be alarmed. It is generally a mild and short-lived reaction, and the organisms responsible cannot live in people.
What is swimmer’s itch?
Swimmer’s itch is an itchy skin reaction caused by microscopic organisms that form part of the natural life cycle of parasites associated with waterfowl and freshwater snails.
The organisms are adapted to their normal hosts, but they can occasionally come into contact with people instead. When this happens, they may cause irritation of exposed skin.
It is not an infection and it is not something that can be passed from one person to another.
When is it more likely?
Swimmer’s itch is more likely to occur during warmer periods when freshwater wildlife is particularly active.
The organisms are more commonly associated with shallow areas and aquatic vegetation, so taking a little extra care around heavily weeded margins can reduce exposure.
This does not mean that the lake is unsafe or that people should avoid paddling. It is simply one of the minor considerations that comes with enjoying a natural freshwater environment.
How can I reduce the chance of a reaction?
Five simple precautions can help prevent swimmer’s itch:
- Avoid spending unnecessary time in shallow, heavily weeded areas.
- Consider using a good quality waterproof sunscreen.
- Cover exposed skin with a wetsuit or rash vest to reduce contact.
- Shower with clean water, ideally using soap immediately after paddling.
- Dry yourself vigorously after paddling.
For most people, any reaction is temporary and settles quickly.
If you develop an itchy skin reaction, a pharmacist can advise on suitable treatment, which may include an antihistamine cream.
Enjoy the lake
We want everyone to continue enjoying our lake and the wildlife that makes it such a special environment.
Swimmer’s itch is simply something to be aware of during the warmer months. A little awareness and a few sensible precautions can help you enjoy your time on the water with confidence.
For a quick reminder of the precautions, see our Swimmer’s Itch information poster below.
