Hi,
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The itching could signal an infection. Is there any foul smelling discharge associated? If yes then it could be due to bacterial or fungal infection (which are common in sexually active women).
Report to your gynecologist/doctor and get a thorough examination and work-up done to get to the cause for the itching. The treatment would vary depending on the cause. Keep the area clean and dry, allow for free air circulation, avoid wearing tight undergarments.
All the best. Take care.