lol... don't worry about it Oden... I had a few UFO's (unidentified floral objects) like that on my plants.. but they didn't really do anything but got me excited for nothing lol.
Just keep an eye on it.. but I wouldn't worry to much...
Mann my plants always pre-sex and my lights always on why you trippin? Lets me know whats a waste and whats not...most plants will pre sex at 7-9th node it'll grow a sac and some hairs or some stupid balls if its male but yeah its not where anything else would grow...it's a good thing if it produces a single female flower with white hairs