Hi, and thanks for your medical question on eHealth forum!
A dark discharge from vagina can be due to a foreign body (like a condom or tempon left behind) or due to cervical cancer or dysplasia, fibroids in uterus or due to fungal infection. You will need ultrasound, STD panel and PAP smear for confirmed diagnosis.
Since a confirmed diagnosis cannot be given on net please consult your gynecologist regarding this. Hope this helps. Take care!
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