B65.3

Clinical Causes: Contact with parasitic cercariae, the larval stage of freshwater schistosomes, which penetrate the skin during swims in contaminated waters. Presence of infected waterfowl or snails that serve as intermediate hosts, releasing larvae into the environment. Frequent swimming in lakes, ponds, or marshes where these parasites are common.

Key Symptoms: Immediate or delayed itching and skin irritation following water exposure. Development of small, red, raised bumps or blisters on areas of the skin that came into contact with contaminated water. A localized rash that may spread, often accompanied by a burning sensation. In some cases, swelling or hives may occur around the affected area.

Diagnosis Path: Diagnosis of cercarial dermatitis is primarily based on the patient's recent history of exposure to potentially contaminated freshwater or saltwater. A healthcare provider examines the skin for characteristic rashes and lesions. In certain situations, skin scrapings or biopsies may be performed to rule out other skin conditions, but typically, clinical history and visual assessment are sufficient for diagnosis.

Treatment Protocols: While the condition usually resolves on its own within a week or so, symptomatic relief can be achieved through various measures. Topical corticosteroids and antihistamines are commonly used to reduce itching and inflammation. Plain antihistamines may help alleviate allergic reactions, and soothing skin lotions such as calamine can provide relief. To prevent further irritation, individuals are advised to dry off thoroughly after swimming and avoid scratching the affected areas. Keeping the skin clean and dry aids in quicker recovery.