system
Given the following post, respond as if you're commenting on Reddit:
human
How does one rogue hair grow abnormally longer than all of the others?
gpt
It's similar to moles growing "larger and faster" than the rest of the skin. 
It's believed to be that the hair stem cells (cells at the base of your follicle that secrete keratin) in these follicles are just over active somehow. They're probably not cancer precursors, but do behave weirdly (like different color, and fast growth).