Cause of 'Treeman's' barklike growths revealed

(CNN) -- For 20 years, the warts studding Dede Kosawa's hands and feet multiplied and sprouted like gnarled roots.

Kosawa said the warts began to appear after he got a cut on his skin as a teenager.

Doctors believe Dede Kosawa's unusual appearance occurred because of a immune defect and HPV.

His hands looked like contorted, yellow-brown branches extending 3 feet. Unable to clamp his hands into a fist or pick up a fork, he made his living by performing in carnivals in rural Indonesia. He became known as the Tre