Duoluton L can be used to delay or regulate menstruation because it contains hormones that control the cycle, but it should be taken only under a doctor?s advice. Recurrent boils at the vaginal entrance are often due to infections like Folliculitis or a blocked gland such as Bartholin cyst. Keep the area clean and dry, avoid tight clothing, and do not squeeze the boil; if it keeps recurring or becomes painful, consult a gynecologist for proper treatment.