While I'm not sure what causes it, I just figured I would let you know that you aren't alone. I have these as well. I've also noticed that these odd hairs are usually a darker color than most of the rest of my hair ( dark brown as opposed to light) and are usually thicker. I just assumed that it was a variation of textures. I hope it's not damage.
I noticed that we are about the same age... maybe that has something to do with it? Do hair textures change as people get older?
Hopefully others will chime in with a more concrete answer. lol
Bookmarks