Acne is a multi-factorial inflammatory disease of the sebaceous follicles of the face, breast and upper region of the back, which predominantly affects adolescents. Acne is the most common of all skin conditions and approximately 80-95% of adolescents develop some degree of acne. Moderate to severe acne affects approximately 20% of adolescents and young adults. Typically, the prevalence of acne declines and resolves over subsequent years around the age of 20. However, in some cases acne will continue into later life affecting both men and women.