• At the base of the finger in the palm called, "flexor tendon sheath cyst"
• They originate from a tube like structure that holds the finger tendons in place, and are generally caused due to tendon irritation (tendinitis).
• At the back of the last joint of the finger called "mucous cyst", next to the base of the fingernail.
• These sometimes cause a groove in the fingernail, or can rarely get infected leading to a joint infection.
• Arthritis or bone spurs in the joint are often the cause of infection to develop.

Foot ganglions-

• Can occur on the upper or lateral aspect of the foot.