How are boils on the vaginal area normally treated in Singapore?

It really depends on the size of the boil and whether it really is a "boil". Your best bet would be to show it to your usual GP or Gynecologist. If it really is a boil, the size and whether you have a fever is most important. If there is a fever, it requires more treatment, sometimes might have to be admitted. Otherwise, small ones can be treated with creams while larger ones might need minor surgery.