This was a long-standing (dreadful joke) foot corn right on the ball of this patients' little toe.
(Under a tailor's bunion)
It wasn't particularly wide, but pretty deep and covered with a thick-ish layer of callus. The first step was to remove the overlying thick hard skin.
(As always, I soften this first with Gehwol Fusskraft Mint.)
With the foot corn exposed I then removed it as far as was comfortable and effective. It was shaped like a classic pyramid, with the narrowest part nearest foot nerves.