Can you get an STI after months of no sexual activity and never having had one before?

I recently had a white/yellow bump in my vagina that was painful anytime it was touched or I went to the bathroom. It fell off today and is still sore where it was but I don’t know how I got it. I haven’t had sex or done anything sexual in at least 3 months and I’ve never had an STI before. I’ve only had one partner and I know for a fact I’ve been the only person he’s ever been with.

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