It wouldn't be Star-San, that is darker in color and has an odor. Likely it is a food-grade lubricant like wilserbrewer said. If it's greasy and has no smell it's probably the same stuff I use, and it won't hurt anything. I'd try to get it out with a paper towel or something and rinse it with soapy water if there is a lot of it, but it's not harmful. Keg lube is a little hard to get off sometimes, especially if you get it on your hands. It leaves a kind of sticky/greasy ick feeling if you don't get it off.
(Spelling is spigot by the way.)