A ganglion cyst is a fluid-filled capsule that can cause swelling on the hand or wrist. It is the most common cause of a lump on the hand. These cysts are benign (not cancer) and will not spread ...

in your forearm or hand. One type of common benign (non-cancerous) tumor is called a ganglion cyst (also known as a bible bump). Ganglions often form on the back of the wrist or on the thumb side of ...