I'm guessing it's the lube slightly leaking out. I mean I wouldn't eat it. It's probably not going to short circuit anything and damage the board. It would be a foolish choice to fill keys with conductive lubricant.

I'm gonna pass on some knowledge that my mechanic gave me years ago when I started getting into self-repair and kept asking him if things needed to be repaired or replaced:

"Does it say in your user manual that you need to do anything with it or is it currently causing issues? No? Then leave it alone. If you start trying to find issues with things that are working well, you're just gonna end up paying for repairs on a thing that'll never work the same again."

Nah just take a q-tip to it