###Human: Why is a PCOS patient noticing blood on inserting finger though missed period? ###Assistant: Hi. I have read your concern. I presume you already know that PCOS causes your irregular menstrual cycle. And it can also present like very scanty bleeding or just spotting today then nothing at all the following day, it is called oligomenorrhea and it is part of the PCOS. However, with the history you have told, you have long fingernails. It is also possible that you have caused a little scratch to the vaginal mucosa that would have caused the mild bleeding. I suggest you set an appointment with obstetrician and gynecologist to prescribe you with pills to regulate your menstruation. In the meantime, if the bleeding is just mild, you need not worry about it.