Knuckle pads.

Knuckle pads are well circumscribed thickenings of the skin over the metacarpophalangeal and, more commonly, the proximal interphalangeal joints. Although the association with several other clinical syndromes including Dupuytren's disease is well documented, most cases are idiopathic. We present a case of knuckle pads and briefly review the history and course of this disease.