A Answers (2)
Mehmet Oz, MD, Cardiology, answeredIncreased production of oil within the skin, often brought on by hormonal changes, can cause acne breakouts. There are other risk factors, including some medications, cosmetics, and even heredity.
Honor Society of Nursing (STTI) answered
Acne outbreaks vary from person to person, and different things may trigger outbreaks for different people. Acne outbreaks can be worse during the winter than the summer, since the sun has an anti-inflammatory effect on the skin. Using oily cosmetics may also worsen acne and cause outbreaks. For women, acne outbreaks are often worse during menstruation.