Hello,
As per your description it appears to be like a wart. It generally occurs in places where body retains lots of moisture.
Next Steps
You need to consult either a gynaecologist or skin specialist. If you are looking forward for homoeopathic treatment for the same, you are most welcome
Health Tips
Maintain hygiene.
Keep vulva region dry
Avoid public urinals esp. western styled
Wear clean under pants