The appearance of acne on the chin before menstruation is due to temporary endocrine disorders caused by fluctuations in estrogen and progesterone in the body, which is generally physiological and will ease on its own after the menstruation. If acne on the face or chin does not disappear after the menstrual period, you should consider acne and go to a hospital dermatologist for an examination, and apply ointment if necessary. When you have acne on your face, you must be careful not to eat spicy and irritating foods, especially chili peppers, which will further aggravate the acne symptoms, and not to use irritating skin care products, and not to wear heavy makeup.