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Acne vulgaris is an inflammatorydisease of the skin, caused by changes in the pilosebaceous units (skin structures consisting of a hair follicle and its associated sebaceous gland).
True acne vulgaris in older adults may be a feature of an underlying condition such as pregnancy and disorders such as polycystic ovary syndrome or the rare Cushing's syndrome.
Acne will generally reappear quite soon after the end of treatment—days later in the case of topical applications, and weeks later in the case of oralantibiotics.