Hello,
Welcome to the ehealthforum and I am really glad to help you out. This small bump can be infected hair follicle or a boil. A Boil is caused by an infection of the hair follicle by staph aureus. Apply warm compresses on the bump and keep the area clean. You should consult a doctor as you might need a course of antibiotics/anti-inflammatories to take care of the same.
Other possibilities are of a cyst, sebaceous cyst, lipoma (fatty deposits) ,fibroma (fibrous tissue deposits) or an external hemorrhoid.
A gynecologistâs examination is mandatory to confirm the diagnosis. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.