Polydactyly is a condition in which the hand or foot has an additional finger or toe. It's the second most frequent type of hand abnormality, and it's present from birth (congenital). Polydactyly normally only affects one hand or foot, not both.
An additional finger or toe is the most common sign of polydactyly. A little additional bump on the side of the hand, a finger that spreads to terminate in two fingertips, an extra finger that dangles from the hand by a thin cord, or a hand with a thumb and five fingers are all examples of this disease.
Polydactyly is usually treated in early childhood with the removal of the extra finger or toe. If the extra digit is not attached by any bones, a vascular clip may be used to remove it. The vascular clip attaches to the extra digit and cuts off blood flow to it. After a short time the extra digit will fall off similar to how a newborn baby's belly button stump comes off.