The causes of acne during physiological period may be caused by clogged hair follicles, changes in hormone levels and other reasons. 1. Hair follicle blockage: Some studies show that during physiological period, the size of the sebaceous gland tube of the hair follicle is smaller than that of other time periods, therefore, it is more likely to happen that oil and airborne dust block the hair follicle. 2. Changes in hormone levels: During the period from ovulation to physiological period, estrogen in women’s body is elevated and the vitality of skin sebaceous glands is enhanced, so it will increase the chances of getting acne. Acne during physiological period is a normal phenomenon, if the phenomenon of acne is more serious, you can go to the dermatology department to consult a professional physician for appropriate treatment.