The prevalence of acne is about 80% in the majority of the countries worldwide. Moderate and severe acne account for 20% of all cases. Prognostic factors of acne severity were identified: hyper seborrhea, an age of beginning of acne after 17 years or pre pubertray, extension of acne lesions to the trunk, stress for the two sexes, and notion of family acne (hereditary). The role of cigarette and food remains discussed. Acne of the adult (man and woman) is in increase and is estimated at 40% of the adults. In addition, recent epidemiologic data reveal that the acneic subject consults little the doctor (on average, one out of two) and, in the same way, only one young person out of two teenagers declaring a severe acne is treated. Actually, acne is regarded today as a chronic disease requiring treatment of induction and maintenance.
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