A 33-year-old man presented with very itchy red papules on the back of
his hands and forearms. These papules appeared about 90 min after he
had cleaned his aquarium in which he kept native fish and watersnails.
He had obtained the watersnails some weeks before from a nearby pond.
Examination of water from the aquarium revealed cercariae. The clinic
al diagnosis of cercarial dermatitis was corroborated. Cercarial derma
titis has repeatedly been seen in swimmers but not in aquarists keepin
g fish in a home aquarium.