Many women experience such presentations especially around/during/immediately after their period.
This kind of presentation is usually due to a change in hormonal
levels or due to the changes taking place due to the period.
I doubt this is a genital wart
and is possibly not even related to an infection.
The best thing would be not to irritate the area by squeezing it, popping it or trying to drain it as this can result in a reinfection. I would advise a biopsy
of the bump and its contents the next time it appears. This can be sent to the laboratory to confirm the source and find the most suitable medication to treat it. This will ensure effective and rapid relief from such a presentation.
Hope this helps.