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Your symptoms are suggestive of Vaginitis which is inflammation of the vagina due to any infection,allergy etc.
Wear loose cotton undies.
Wash the genitals with any antibacterial soap and water.
You can apply Neosporin powder after discussing with your doctor.
Apply Calamine lotion for relief from itching.
If the symptoms persist consider visiting a Gynaecologist for evaluation.
Take Care!