I am a 25 year old female and have never had sex. I have been feeling hard skin-colored painful bumps on my labia, mostly on the hairless parts (a single bump which can be felt under skin when I touch it but most of the times can't be seen, and it's not itchy and doesn't contain pus), which comes once in a while and goes away after a few days/weeks.
It's not like pictures of herpes/warts I have seen on the internet. Should I have it checked or it's harmless? What is the possible cause?