A small, firm, painless lump like this near the inner labia is usually a benign skin issue, such as a blocked skin gland, an ingrown hair, or a small cyst. These are common and usually harmless, especially since it isn't painful, red, or leaking anything.
Next Steps
Keep the area clean and dry, and avoid squeezing or popping it. If it hasn't shrunk within one to two weeks, or you notice any change, see a gynaecologist in person for an examination.
Health Tips
See a doctor sooner if it becomes painful, grows quickly, turns red, or starts oozing or bleeding.