A ganglion cyst is a fluid-filled sac that often appears as a bump on or around joints and tendons, commonly occurring in the wrist and hand. However, ganglion cysts can also develop in the foot, usually at the top of the foot or at the ankle. The cyst is typically round or oval-shaped, and may be soft or firm to the touch. In some cases, the cyst may cause discomfort or pain, especially if it presses against a nearby nerve or tendon. Treatment options for a ganglion cyst include observation, aspiration (draining the fluid with a needle), or surgical removal. However, ganglion cysts may recur after treatment. It’s best to consult a healthcare professional for diagnosis and management of ganglion cysts.