Experiencing only light spotting after taking Meprate (medroxyprogesterone acetate) is quite common and generally not a cause for concern, especially for a 14-year-old. At her age, her body's natural hormone levels are still maturing. If her estrogen levels were low or if the small cyst temporarily altered her hormones, the lining of her uterus might have remained thin. A thinner lining naturally results in very light bleeding or spotting rather than a heavy period. This is a very common response to the medication. However, if she experiences severe pain or if you have continued concerns, it is always a good idea to check in with her pediatrician or gynecologist.