What Causes Adult Acne? There are many reasons you can break out as an adult. Stress or changes in your hormone levels, like menopause or switching or stopping birth control pills, are two. Mar 22, · A surge in testosterone causes your oil glands to produce more, elevating your risk for bacterial infection to occur in your skin pores, causing pimples to 4some.xyz: Quora Contributor.
Oct 31, · In some cases, adult acne could be a symptom of another health condition, the AAD says. For instance, one common hormone-related condition that results in acne is polycystic ovary syndrome .