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This is typical od Trichomonas vaginalis
infection of the vagina, although it is not confirmed unless a vaginal smear is tested. Usually vagina gets very itchy in this disease. Avoid having sex without condom till you are diagnosed and treated because this can be sexually transmitted. The contraceptives may usually predispose to Chalmydia and Candidia
infection. You can consult your Gynaecologist and get tested and treated for the cause. Drink plenty of water.