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Could be sweat, of course, but also might be water from the river, or worse still seropurulent drainage, a sure sign of infection, so you find the hand sanitizer in the medicine cabinet and squeeze some onto your fingertip, which burns like hell, and then you wash your hands thoroughly, singing your ABCs while you do to make sure you’ve scrubbed for the full twenty seconds recommended by the Centers for Disease Control, and then you carefully dry your hands with a towel.

Seropurulent, sē-rō-pū′rōō-lent, adj. composed of serum mixed with pus.—adj.