The use of light treatment for acne is not a new idea. For some time it has been known that sunlight improves skin suffering from acne, unfortunately the harmful UV rays can cause skin cancer. After finding that artificial UV rays were not as effective as sunlight, scientists studied the relationship between acne and light more closely.
Scientists and Dermatologists discovered that certain visible violet light within sunlight, ranging from 405 to 420 nm, activates a porphyrin, which is a part of the acne-causing bacteria called Propionibacterium Acne. When the porphyrin is activated it releases singlet oxygen and thereby damages and kills the bacteria. In essence the acne bacteria self-destruct.
More good news is that this range of light waves falls just outside the ultraviolet spectrum and will therefore cause little, if any, skin damage. In fact most treatments are followed with the application of red light waves, which have been shown to increase the skin's healing processes. After just 3 consecutive days, light treatments have been shown to safely reduce bacteria in the pores by 99.9%. These treatments are usually created by fluorescent lamps, high-intensity LEDs or dichroic filament bulbs.
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