Your recurring, painful bumps down there are most likely folliculitis, inflamed hair follicles from shaving, waxing, sweating or tight clothing. It's common and not a serious skin condition on its own, though it can keep coming back if the irritation causing it isn't fixed.
Next Steps
Wear loose cotton underwear, skip tight synthetic clothing, and go easy on shaving or waxing in that area for now. A warm compress on an active bump can help it settle faster. If the bumps keep recurring or one turns large and very painful, please see a gynaecologist to check for an underlying cause and the right antiseptic option.
Health Tips
See a doctor sooner if a bump keeps growing, turns very hot and swollen, or comes with fever, since that can need draining under medical care.