Hormones
Changes in hormones when you go through puberty or during a menstrual cycle, can be one of the main causes of acne in most people. This is specifically true for male hormones or androgens such as testosterone. The rise in hormonal levels could lead to a process of high sebum production, inflammation, changes in skin cell activities, and colonization of hair follicles, which all result in acne. This often rears the ugly head in the form of painful and deep cystic acne on your back, neck, and chin. [2]
