Sounds like the rogue hair I find on the outer edge of my ear from time to time...has that same characteristic, I never notice it growing, it just seems to pop out, fully grown & ready to pluck...until next time...
maybe not as annoying as the wild hair I used to get on the side of my nose...it would pop up, light & fine, not visible to anyone but me...but it was in a very strategic location, right in my line of sight when the light would catch it a certain way, & it was all I could see...of course, it was hard to see it in the mirror as well, so it would elude my attempts to find it & pluck it...now that I think about it, maybe it's still there, but I just can't see it anymore with these middle-aged eyes...

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