It's often assumed that only teenagers are afflicted with acne. Many of us know that's simply not the case. But what causes acne? These articles explore the reasons and theories why acne occurs, whether in our teens or at another life stage.

• Acne During Pregnancy
  Acne during pregnancy is a common result of an increase in hormone production. What can you do about it?
  
  
• Adult Acne And Hormones
  Hormonal imbalances don't just affect adolescents - adult acne can be caused by hormones too.
  
  
• Theories On What Causes Acne
  There are many theories on what causes acne, but it seems likely that the problem is caused by a number of different factors.