Black streak, should I be worried?

[Chirpy_Girl]

One of my girls has a black streak in her beak. It’s not raised or textured, but it has grown in length. She is perfectly happy and it doesn’t seem to bother her at all. Should I be worried?

 

[Wyorp Rock]

Looks like she's nicked or cut it at some point. I would leave it alone, it should be fine.