"Bouton on the small labia of the vagina, what can I do?"

It is possible that the bump you are experiencing could be a hair follicle that has become inflamed, possibly from shaving. If you have noticed any changes such as increased swelling, redness, or pain, it would be best to seek medical advice. In the meantime, you can try applying a warm compress a few times a day to help soothe the area and avoid picking or scratching at it. If the symptoms worsen or do not improve after a week, it is recommended to consult a healthcare professional for further evaluation.