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Your symptoms are suggestive of yeast infection and can spread to whole pelvis if left untreated.You require a thorough examination to rule out the exact cause and take the treatment accordingly.
Some suggestions:
Wear loose cotton undies.
You can use OTC available antifungal medications and apply them regularly.
Avoid douching,tampoon usage and any harsh chemicals.
Eat lots of yoghurt in diet.
Consider visiting a Gynaecologist earliest for examination and take the appropriate treatment regularly.
Take Care!