Bleeding or spotting between periods can be caused by a number of factors, according to Tracee Cornforth for About.com. These include implantation/pregnancy, low thyroid levels, stress, missing oral contraceptives, vaginal infections, miscarriage, hormonal fluctuations, intrauterine devices and certain drugs that cause vaginal dryness.
Try keeping a record by simply marking a calendar of when the period begins and ends and any other bleeding that occurs. This can be shared with a gynecologist or family physician. Any bleeding or spotting between periods should be discussed with a doctor, as it could be a serious issue that needs to be resolved professionally and not at home with remedies, notes Cornforth.