Scratch
From Ardrana
A scratch cantrip causes the subject creature to experience an annoying itch on some portion of the body, at which the subject involuntarily scratches. The scratching takes but a second and immediately causes the itch to cease.
Note: This spell originally appeared in this form in Unearthed Arcana for Advanced Dungeons & Dragons (1st edition) from TSR. Its use here is for the purposes of providing context for the campaign only.