Space barnacle

"Finally, there's the lumps and the hunger for ant-flies. They stick to your face like blemishes. Like space barnacles."

- Unidentified Ithorian's notes

Space barnacles were spaceborne barnacles who, like ant-flies, stuck and clinged to surfaces like blemishes.

Behind the scenes
Space barnacles were first mentioned in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical. They were later made canonical with the publishing of Musings of an Ithorian on Star Wars Hyperspace.