A 65-year-old man visited us with a painful penis after receiving an injection of hyaluronic acid into the penis for male genital augmentation. On admission, physical examination revealed black necrotic lesions and ulcerations on his glans penis. We performed partial penectomy to remove the necrotic tissues. Histopathological examination showed necrosis with severe inflammatory infiltration in the dermis and subcutis. Glans penile necrosis due to hyaluronic acid injected into the glans penis for male genital augmentation is exceedingly rare. This case is reported herein along with a review of the Japanese literature.