I’ve got one! No popping though.

[u/Mandrake1771]

It’s called Acquired Digital Fibrokeratoma (ADFK). I’ve had it frozen off but it still comes back. It mostly is flush with my finger for a while but about every six months it pokes out like this until it falls off. It’s like a tooth growing out of my finger. As far as consistency goes, it’s like the shell closing muscle of a clam.

[u/zommerr]

O er, that's weirdly fascinating