Acne is a very common worldwide skin problem [3]. It is most commonly experienced by teenagers, suggesting a hormonal influence. The fact that approximately 80% of teenagers have acne supports the hormonal hypothesis [3,4,1]. However, the various studies report prevalence in adolescents ranging from 28.9% to 91.3% [5-7]. During adolescence, acne tends to be more common in boys than in girls. It reportedly occurs among 95% to 100% of boys 16 to 17 years old and 83% to 85% of girls in the same age group [3]. In the US, acne is the fourth most common reason for seeking medical consultation among patients aged 11 to 21 years, and it accounts for 4% of all visits from patients aged 15 to 19 [7,8]. Kilkenny et al. recorded a prevalence of acne in 27.7% of students aged 10 to 12 and in 93.3% of adolescents aged 16 to 18 among a cross-sectional cohort of 2491 students in Victoria, Australia [9]. Acne vulgaris involves important anatomic, physiologic, biochemical, genetic, and immunologic factors [3]. It is known to have social consequences and a psychological impact on patients. Acne can produce anxiety, depression, and other psychological problems that affect patients' lives in ways comparable to life-threatening or disabling diseases [9]. In addition, acne can affect teenagers' social, vocational, and academic performance [10]. Aktan et al. reported that severe acne may lead to scarring and disfigurement [11,12]. Thus, in a study by Picardi et al. suicidal ideation was reported in a group of patients with acne [13]. According to Poli et al. people have a lot of wrong beliefs and misunderstandings about acne vulgaris [14]. His group recorded that 80.8% of 852 French people surveyed did not believe acne to be a disease but rather a normal phase of adolescence, although 69.3% agreed that it should be treated. Many of adolescents in the study thought that gender, excess weight, eating dairy products, and physical activity did not influence acne and that frequent washing could improve acne. In addition, people thought that eating chocolate and snacks, smoking cigarettes, sweating, not washing, touching or squeezing spots, eating fatty foods, using make-up, pollution, and menstruation could all worsen
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