A 19-year-old female asked:
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a large, dark bruise randomly appeared on my calf this afternoon. i had taken plan b this morning and had a minor bike crash last night (w/o bruises)?

1 doctor answer
Dr. David Bare
49 years experience Family Medicine
Bike not Plan B: Plan B is a morning after pill that prevents ovulation or fertilization and is a hormone called progesterone. There are no indications that it causes general increases in bleeding disorders although a female can have vaginal blood flow with it. The bruise is most likely from the minor bike crash and it took a while to "come to the surface.
Answered on Nov 28, 2015

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