What's this on OHs knuckle

[plasterboots]

It's rock hard like a ball bearing is in it!

Wart?

@flumpybear that's what he's saying which is very disappointing as it means u can't have a squeeze

Maybe a little ganglion?

I don’t think it is a ganglion, I have these as well, and it is the skin that has thickened, a ganglion is under the skin

It’s a wart. You can get wart stuff from the chemist to remove it.

Stab it with a needle see what happens
(In my professional medical opinion lol)

Give it a squeeze - go on!!