Polydactyly is not a genetic disease in and of itself. It is a condition where an individiual has more fingers or toes than normal. Dispite not being a disease on its own, polydactyly is associated with:

Ellis-van Creveld syndrome (chondroectodermal dysplasia)

Carpenter syndrome

Trisomy 13

Rubinstein-Taybi syndrome

Smith-Lemli-Opitz

Laurence-Moon-Biedl syndrome

Asphyxiating thoracic dystrophy

Individuals with polydactyly have more than 5 fingers on their hands or feet. These appendages are usually small and unusable, although rarely they can be fully functional.

Extra fingers and/or toes are sometimes incredibly small and can be removed by tying a string around them for a few days. However, larger digits may require surgery to remove. Satisfaction with the treatments are usually greatest when surgery occurs around one year of age.