Abstract: Cercarial dermatitis (swimmers' itch) consists of urticarial papules that form when the larvae of avian parasitic flatworms penetrate the skin. Cercarial dermatitis is common in the summer months where heaviest recreational swimming occurs, and when the temperature is ideal for amplified schistosome development.
Cercarial dermatitis usually occurs with exposure to fresh water, but can occur with shallow salt water exposure as well.
The eruption typically occurs on uncovered skin 12-24 hours (up to 8 days) after exposure.
The eruption is self-limited, lasting 4-10 days (up to 20 days).
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