Acne on the face before a period is caused by fluctuations in hormone levels before menstruation, such as a drop in estrogen and progesterone levels. If acne on the face is more obvious, you can consider visiting a dermatologist and treating it with medication under the guidance of a doctor, paying attention to a light diet. It can also be treated with short-acting oral contraceptives, such as Daing-35, which has the effect of treating skin acne or lowering androgen levels, starting on the first day of menstruation, taking it for 21 consecutive days, stopping for 7 days, and starting the first tablet of the second box on the eighth day. It also has a contraceptive effect, but it is usually taken for more than 2-3 months to have the effect of treating acne.