Garanian bolite

From Memory Alpha, the free Star Trek reference

Garanian bolites are tiny insects that have a peculiar effect on humanoids when they are brought into close contact with them.

In 2369, Nog and Jake Sisko played a trick on two Bajoran customers at the replimat. They put a small box with Garanian bolites next to their seats. After a little while, those Bajorans started to feel an itching sensation and their hands and faces first turned blue, then yellow, then green after which the sequence of colors repeated. However, a few seconds later, the effect of the Bolites ceased, and everything returned to normal. (DS9: "A Man Alone")