sozobe wrote: Seems like a major infection risk.
Thoughts?
I once had a complete fingernail ripped off when I was about Sozlet's age. Doctor's orders were to bathe the finger in the hottest soap water I could bear every day, and wrap it into a new bandage every day, to prevent infection. (The doctor, ahead of her time in the 70s, adhered to the "don't evolve antibiotic-resistant germs" school of medicine. This school scorns at abusing antibiotics for disinfection, hence the very hot soap water and no antibiotics.)
My fingernail grew back within a couple of months (don't remember more precisely), and it grew the same way it grows when it's not ripped off: Millimeter by millimeter, full thickness, down the fingertip. There was a thin film, as there is on any wound, but it didn't grow thicker. The wound healed with no traces left behind. It seems the key is to keep it clean to avoid infection, but also clear of hairs etc. in that thin film, anything that might cause trouble if the nail grows over it. I would guess that what worked for my fingernail would also work for Sozlet's toenail. Probably it's still a good idea to let a doctor look at her.
ehBeth wrote: I always have better recovery from cuts/open wounds/nail segment loss if I spend a fair bit of time in the swimming pool. hamburger has a theory that it's because of the chemicals in the pool.
My childhood doctor -- same as above -- confirmed this. That was after a bike accident had turned the whole right side of my face into an open wound one summer. She encouraged me to spend as much time as possible in the swimming pool for the next few weeks, as the chlorine disinfects the wound.