Acne vulgaris also known as cystic acne is a human disease, characterized by areas of skin with seborrhea, comedones, papules , pustules, Nodules and possible scarring. Acne generally rises in skin with the densest population of sebaceous follicles. Affected areas include the face, the upper part of the chest, and the back. Severe acne is inflammatory, but acne can also manifest in noninflammatory forms. The lesions are caused by changes in pilosebaceous units, skin structures consisting of a hair follicleand its associated sebaceous gland, changes that require androgen stimulation.
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