During childhood, the sebaceous glands are small and virtually nonfunctioning. These glands are under endocrine control, especially by the androgens. During puberty, androgens stimulate the sebaceous glands, causing them to enlarge and secrete natural oil called sebum, which rises to the top of the hair follicle and flows out onto the skin surface. In adolescents who develop acne, androgenic stimulation produces a heightened response in the sebaceous glands so that acne occurs when accumulated sebum plugs the pilosebaceuos ducts. This accumulated material forms comedones.
Thus you will have people mistakenly attributing their acne to cosmetics, or food, or hormonal changes, or certain drugs, but the truth is that these are merely triggers and not the causes of acne. As Dr Waite says, "People experience hormonal changes at many stages, such as puberty, menstrual periods, pregnancy, or even in times of intense anxiety. Similarly, people who perspire excessively may attribute their acne to sweating, but these do not create acne, they just help bring it out."
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