The blue light which kills the bacteria comes from LEDs. LEDs are light emitting diodes. These are solid state devices which have a very long life span and are immune to vibration and shock (dropping the device, for example). They are different from regular light bulbs in that they can be made very small and energy efficient and they are made to emit light in a narrow band which allows them to effectively treat the acne without damaging your skin.
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.
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