In platelet-rich plasma (PRP) therapy, various growth factors and cytokines released the α-granules contained in platelets after activation can potentially enhance wound healing by delivering. We report a patient in whom treatment with PRP, prepared using a syringe-centrifugation-system PRP kit (KYOCERA Medical PRP Kit), for a fistula following bursitis of the lateral malleolus, which could not be healed with conventional wound therapy, led to successful healing. A 58-year-old man was on dialysis for type II diabetes and chronic renal failure. In the left lateral malleolus, septic bursitis developed, leading to a refractory fistula with a subcutaneous cavity measuring 4 × 3 cm, which persisted for more than 2 months. Platelet-rich plasma was prepared using the KYOCERA Medical PRP Kit (KYOCERA Medical Corporation, Osaka, Japan) and infused into the cavity twice to close it. After this procedure, the cavity size reduced, but the orifice and subcutaneous cavity were not closed. Therefore, additional PRP therapy was conducted after 10 weeks of the first PRP session. Complete closure was achieved 13 weeks after the first PRP therapy. In the present case, PRP was prepared using the KYOCERA Medical PRP Kit, and wound healing of a fistula with subcutaneous cavity following bursitis of the lateral malleolus was successfully cured. The KYOCERA Medical PRP Kit was useful, because PRP could be prepared simply and inexpensively using the syringe-centrifugation system.