Ookami-kun said:
Damn, I can't autofocus my fingernail >_<
I had something like that once in college. Then a fungal infection started (or showed up), yellow/brownish. Eventually consumed my entire fingernail and peeled off, leaving a small new nail in my fingernail bed that over 1-2 months grew back into normal.
By the time I talked to my doctor about it, it already was growing back. She said that I could have even just dipped my finger into bleach to kill it earlier. That makes sense, but a little harsh.
Edit:
I just remembered some more details. It started with a black line that grew in the center of my nail. Either starting from the bottom or top, I don't remember. Was kind of irritating. That line grew for a month before the infection showed up. Not sure about the causality - if whatever that black line was caused by the infection or allowed it to infect.