This is a piercing generally done vertically through the pad of tissue between the labret and the bottom of the chin. It’s best done with a flexible PTFE bar and titanium balls, however spikes can be attached to the bottom for effect.
At Body Pleasure Piercing, we did our first chin piercing in roughly 1998. This was an experimental piercing that also did not take off due to the difficulty in healing it and the risk of rejection and subsequent scarring. It did heal and the client got some time with his piercing when someone tore it out in a nightclub for no apparent reason. We have done several others over the years, but I am not aware of this piercing being performed anywhere else.