RI1
You're basically correct; Duck Itch is caused by a parasite that burrows under the skin. And, both ducks and snails are "hosts" for the parasite at different stages in its life cycle.
Another technique for preventing it is toweling yourself very thoroughly when you come out of the water; that destroys the parasites before they have time to burrow.
There was a very extensive thread on this subject last year. I don't know how to post a link, but it should be easy enough to find, and well worth the effort.
Silver Duck
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