There are a lot of myths about the causes of adult acne but the main culprits seem to be hormones and bacteria. One of the hormones that have been linked to acne in adults is called androgen and it is present in both males and females. The link between this hormone and acne was established when it became clear that a lot of woman experience adult acne during certain times of the month. What happens is that certain glands in the hair follicles become overactive and enlarge causing them to produce more oil than normal. This oil is called Sebum and it is what lubricates the skin and hair. An overproduction of Sebum leads to the hair follicle becoming clogged up and thus acne is formed. Bacteria on the skin can have the same effects, which is why it is important to practice a regular and healthy skin care routine.