I have urine stains it is like a brown or red dot on my underwear although i've done urinalysis the doctor said there is no need to prescribe antibiotics. what to do?

Urethritis?: You may have urethritis, e.g. gonorrhea, chlamydia, or nongonococcal urethritis. Urinalysis often is normal. You need to be directly examined, preferably without urinating for 2-4 hours before exam, to see if discharge is present; and you must be tested for gonorrhea and chlamydia. Good luck.

Urethrorrhagia: Included in differential diagnosis (possible causes) of blood in urine.Typicallyresuts in few drops of blood towards end of urination + drops of blood, which can turn brown, on underpants.Often associated with mild stinging on urination from associated non infectious urethritis. Mostly in adolescent & young males & urinalysis otherwise negative. Worth getting bladder utrasound if problem persists