I agree with the testing thus far.
Urethral polyps are relatively rare, and they are mainly caused by congenital conditions. It can indeed lead to UTIs, as well as obstruction and hematuria.
I am not a urologist, and cannot comment on polyps that are normally treated with long-term antibiotics.
Obtaining another urological opinion can be considered to be sure that a surgical procedure is not an option.
Testing the urine for infection can be done to target antimicrobial therapy.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
www.kevinmd.com