What could be the reason for spotting with offensive odor in a 30-year-old female on contraceptives?

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Which contraceptive are you taking? Is there itching or any other lesions? How much is the discharge? Is there a burning sensation during urination or an increased frequency of urination? The discharge could be of some local infection or any other local lesions. There is also a possibility of implantation bleeding which usually occurs around the 14th day of menstruation. To avoid local infections, keep that area clean and dry, and change undergarments twice a day.

Hope this information helps.

Thank you.