There are various types of acne. The most common form is acne vulgaris, which is the familiar rash that affects many teenagers. Acne vulgaris is more common and tends to be more severe in males. The condition is triggered by hormonal changes at puberty and may appear as early as the age of 10. The rash usually subsides after adolescence but may persist after the age of 30. Acne can cause great psychological distress, and teenagers may feel especially self-conscious about their appearance.
More unusual forms of acne include occupational acne, which results from exposure to certain types of industrial oil, and drug-induced acne, which is caused by some prescribed drugs,...