Linea Nigra Before Pregnancy: Causes, Symptoms & Folic Acid

Question
Even though I have never been pregnant, I have a linea nigra, which I've had most of my life.
It runs from my navel to the pubic area.
I have been told it is hyperpigmentation and folic acid can reduce it.

I just want to know, how common is it for a female to have a linea nigra who has never been pregnant?  

Answer
Kelley,

Sometimes this can happen.  It isn't super common, but it can happen (it's sort of almost like a birthmark).  You can try to take folic acid to reduce it, but it may never go away.  Also, things like exposure to sun may make it look darker.  I hope this helps!