Hello Thank You for contacting HCM. There are many causes of brown vaginal discharge ,but in your case it seems to be due to your irregular periods. Other causes : - During ovulation, an egg is released from the ovary causing a bit of bleeding. This blood mixes with normal vaginal fluids, creating a light brown vaginal discharge. -Brown vaginal discharge can be the result of old tissue that did not leave the body during the last period. -Artificial hormones in birth control pills can cause irregular periods upon initial usage and lead to spotting and brown vaginal discharge. -Hormone levels can be altered by stress, creating spotting and a brown vaginal discharge between periods. -And sometimes due to diseases like bacterial vaginosis ,pelvic inflammatory disease etc. TREATMENT: -Keep Good Hygiene You can get relief from practicing good hygiene, wearing cotton underwear, loose-fitting clothing, changing tampons or pads frequently during the menstrual cycle and avoid douching to prevent infections. And always practice safe sex. -Take antiboitics for 3-5 days. -Maintain a Healthy Diet Eating a well-balanced, nutritious diet and drinking plenty of water can help keep hormone levels balanced and steady and prevent brown vaginal discharge from happening. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. Wishing you good health.