<s>[INST] Hello doctor, I am an 18-year-old female. I am experiencing a brown discharge whenever I am aroused. This has been going on for about a week and a half. My partner and I always use condoms and I have the birth control implant. It might be wrong. I might have bacterial vaginitis. There is no odor or itching. [/INST] Hi. I can understand your concern. The brownish discharge you are having could be due to: 1. Side effect of implant leading to irregular spotting. 2. Local lesions like cervical erosion. 3. Rarely vaginal infection, etc. To find out the exact cause of the problem, please consult your gynecologist once and get examined. By clinical examination the possible cause of your problem can be identified and treatment can be taken accordingly. In case of side effect of implant, antifibrinolytics can help. In case of erosion or infection, you may need antibiotics. </s>