Historically, when it has occurred, it has often been concomitant with cutaneous tuberculosis, and it was formerly thought to be always a reaction to the TB bacteria.

[1] The medical eponym Bazin disease was historically synonymous, but it applies only to the tuberculous form and is dated.

Abnormal arterial supply causes low-grade ischemia of ankle region.

On palpation, small superficial and painful nodules are felt.

Fresh crops of nodules appear in periphery of ulcer and ultimately break down.