The bulge on both sides of the penile urethra may be caused by inflammatory infections, localized polyps in the urethra, and urethral cysts. 1. Inflammatory infections: such as urethritis caused by gonococcal or non-gonococcal infections, the affected area will show swelling, congestion and other manifestations, accompanied by urethral tingling, urinary frequency and urinary pain and other symptoms. 2. Urethral polyps: generally caused by viral infection or wart infection, manifested as urethral granuloma, patients will have difficulty urinating, hematuria, urinary frequency and urinary pain and other symptoms. 3. Urethral cysts: located in the urethral opening, round, smooth surface, thin cystic wall of the cystic swelling, often caused by congenital developmental abnormalities of the urethral paraganglionic glands or improper local cleaning. If you are not feeling well, you should go to the hospital in time, under the guidance of the physician, to identify the cause and give targeted treatment.