A cyst is an enclosed sac that contains fluids and semisolid material. Cysts can develop on any part of the body, including the feet. Foot cysts typically develop as a result of foot trauma, but can also arise without reason, says Premier Podiatry. The most common types of foot cysts are ganglion, synovial and cutaneous mucoid cysts, according to the Fox Mill Foot and Ankle Center. Treatment generally consists of draining the cysts, a corticosteroid injection and/or surgical excision. Foot cyst surgery complications are rare, but it is important to know the risks. Infection