Swimmer’s Itch

Diagnosis

Swimmer’s itch, also called cercarial dermatitis, is usually diagnosed based on your recent exposure to freshwater or saltwater and the characteristic rash. Your healthcare professional will typically:

• Ask about recent swimming or wading in lakes, ponds, or oceans.

• Examine the affected skin for small red bumps or blisters that may be itchy and appear within hours of water exposure.

• Consider the timing and pattern of the rash to distinguish it from other skin conditions, such as allergic reactions, insect bites, or contact dermatitis.

Laboratory tests are generally not needed unless the rash is severe, persistent, or atypical, in which case a skin scraping or biopsy may be done to rule out other causes.

Treatment

Swimmer’s itch usually clears on its own within a few days to a week. Treatment focuses on relieving symptoms and preventing secondary infections.

Symptom relief may include:

• Applying anti-itch creams or lotions containing hydrocortisone or calamine.

• Taking oral antihistamines to reduce itching and discomfort.

• Using cool compresses or oatmeal baths to soothe irritated skin.

Preventing infection and complications:

• Avoid scratching the affected area to reduce the risk of infection.

• Rinse off with clean water immediately after swimming to remove any remaining parasites.

• Towel dry thoroughly and change out of wet swimwear promptly.

Severe or persistent cases may require a healthcare professional’s evaluation for additional treatments.