What causes a cyst on the finger?

Answer:
The most common cause of a cyst in the finger is related to arthritis. An arthritic joint produces more fluid than normal joints and the fluid escapes, thickens and forms a fluid collection outside the joint and is visible underneath the skin.

The most common location for these cysts is at the base of the nail.
First answer by Handarmdoc1. Last edit by Handarmdoc1. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].