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Brown discharge could be due to many causes that includes pregnancy, infection like Gonorrhea or Chlamydia, PID, vaginitis, ovarian cysts, uterine fibroids, use of hormonal contraceptives, cervical dysplasia, cervical erosion, etc. Consider visiting your doctor/gynecologist at the earliest. Only after a careful examination and investigations (vaginal swab/smear test, PAP smear test, hormonal analysis) the exact cause can be made out. Treatment as needed (based on your examination and investigation results) would be started to help you. If infective cause is detected, get your partner also treated simultaneously to prevent re-infection (if you are sexually active). Drink plenty of water. Avoid vaginal douching, use of harsh soap, perfumes or deodorants in the area. Use loose cotton undergarments. Avoid tight fitting clothes. Keep the area dry and clean.
Take care.