Can pcos untreated cause a woman to bleed after clitoral stimulation?

No effect: that should not really have an effect. they are totally unrelated. but with PCOS one can bleed at any time

No: PCOS is never a primary cause of bleeding due to clitoral stimulation. Since bleeding with PCOS is usually irregular, the two could happen together by coincidence. In general the clitoris is unrelated in any cause-and-effect way to bleeding. If this continues seek help from a doctor. Good wishes.