I sort of hesitate to put this here, but it's DIY-related (or work...)
and I'm hoping there's a DIY fix.

There's a vertical split in the top of the nail on my pointing finger. I
don't want it to catch on something and rip off, or get worse (it's only
4-5mm into the pink zone). I want to get ti to heal.

I have had it in sticking plaster for about 6 weeks, but the split
continues down as the nail grows. Bloody nuisance.

Any ideas/experience?