Prolonged deposition of uric acid crystals in the joints of the feet, protruding from the skin and forming ruptures. The first step is to treat the primary disease, gout, and treat acute gouty arthritis as prescribed by your doctor to control uric acid production or promote uric acid excretion and control hyperuricaemia. At the same time, the foot should be well cared for and the gout stone should be removed surgically if necessary.