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Changes in vaginal discharge in term of quantity and consistency can vary with hormonal status and sexual stimulation/thoughts. If the discharge is associated with change in color, smell, consistency, associated with itching, burning, rashes etc, then it would suggest possibility of infection. You will need to visit your gynecologist/healthcare provider and request for examination and vaginal smear/swab test to identify the causative agent and get started on treatment. If you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection.
Take care.