(HealthDay News) -- Acne results when the skin's oil glands make too much of an oily substance called sebum. This can plug pores, triggering bacterial growth and skin lesions that we commonly call pimples.

Among women, a variety of factors can prompt an outbreak of acne. The U.S. Department of Health and Human Services offers this list of possible triggers:

  • Hormonal changes during puberty, or during the menstrual cycle.
  • Changes in hormone levels caused by starting or stopping the birth control pill, or menopause.
  • Some medications, including those that treat epilepsy and depression.
  • Wearing makeup.
  • Pressure or rubbing against the skin, such as from a hat or helmet.
  • A family history of acne.