duck itch
n.— «Also known as, “swimmer’s itch,” “clam digger’s itch,” and “rice paddy itch,” this seems to be a bane of bathers on every continent. Duck itch is an intensely itchy, red, pinpoint rash appearing after swimming or wading in fresh water. Caused by an innocent case of mistaken identity, the rash is the result of penetration of the skin by a tiny parasite.» —“Turns out ‘duck itch’ is an annoyance for swimmers everywhere” by Christopher Bartlett MaineToday.com May 29, 2005. (source: Double-Tongued Dictionary)
Further reading
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