PDE5A and scleroderma: Vasodilators such as calcium channel blockers, PDE5 inhibitors, and prostacyclin analogs are recommended treatments, but they often have side effects and are not always effective. Ozone is an oxygen donor, an immunomodulator, an inducer of antioxidant enzymes and the endothelial nitric oxide synthase, a metabolic booster, and a stem cell activator. I report the case of a scleroderma patient treated effectively with autohemotherapy with ozone and a clear reduction of Raynaud's episodes and resolution of the edema of the hands.