What causes itching around the vaginal opening during menstruation?

Patient's question:

Hello! My period came this week, but my vaginal opening is very itchy! It's so itchy that I keep showering to feel a bit better. As for cleanliness, I've been very careful! What medicine should I use? What's the problem? First follow-up question: Thank you, doctor!
Could it be an STD? I haven't had sex with anyone! What causes the itching? Which department should I go to at the hospital for a check-up?
Second follow-up question: Does it have anything to do with an STD? Could it be an STD?
Third follow-up question: Strange, but why am I not itchy now?

Doctor's answer:

Hello friend:
Based on the symptoms you are currently describing, you may have already been infected with some bacteria. However, whether it is a simple infection of a certain type of bacteria requires you to go to the hospital for a test of vaginal discharge to rule out other bacteria and mixed bacterial infections. The itching in your vagina is a manifestation of inflammation stimulation. It is best to promptly go to the hospital for relevant examinations, which is the wise choice.
You can also use a 0.5% potassium permanganate solution for cleaning. A small bottle of potassium permanganate costs about 0.8 yuan, and it is generally available at pharmacies.

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