Bruise-leech crawlers, alternatively known as Nelvaan bruise-leech crawlers, were leech-like creatures native to the Outer Rim planet of Nelvaan. Orvos, shaman of Rokrul village on Nelvaan, covered Jedi Knight Anakin Skywalker's chest with bruise-leech crawlers as part of a ritual before sending him off to destroy a nearby Techno Union laboratory. The leeches caused pain as they crawled over Skywalker's torso and left behind blue trails.