Unfortunately, it isn't possible to say what is causing your
spottingVaginal bleeding between periods with the information given. It is best to see your doctor, check your blood tests and possible get an ultrasound and/or uterine biopsy and exam to see if there are any cysts, polyps, or other problems. Most of the time nothing bad is going on, but it isn't possible to say without more information.
Machelle M. Seibel, MD