[SoftTalker]

I had it in my facial hair a few years ago. Two bare patches. My barber said it was likely stress-related (though I didn't feel stressed out at all). Then a year or two later it went away for no apparent reason. Nothing had really changed in my life that I could think would affect my stress levels. In other words, both its appearance and disappearance are a complete mystery.

I also have almost no hair on my legs below my mid-calf, and I did when I was younger.

[Sateeshm]

Every few years I get a patch on my beard or hair that grows about 1.5 inches. But hair comes back in full in a few months, as if it never happened.