GLOSSARY : Oily skin with imperfections
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Acne is a form of chronic inflammatory dermatitis of the pilosebaceous canal. Two types of lesion are linked to acne: retentional lesions (blackheads or microcysts) and inflammatory lesions (papules, pustules, nodules or nodular cysts). The most common scenario is that both types of lesion coexist: it is known as mixed acne.