It uses sebum as a nutrient for growth, therefore increases in follicles during puberty. People with acne have more Propionibacterium acnes in their follicles than people without acne. The presence of bacteria attracts white blood cells to the follicle. This process causes an inflammatory response seen as papules (red bumps), pustules, and nodules. The bacteria also cause the formation of free fatty acids, which are irritants, increasing the inflammatory process in the follicle.
The American Academy of Dermatology has reported that Blue LED Light Therapy can be used to destroy the bacteria that produces the inflammation associated with Propionibacterium acnes.
Other studies have shown that a combination of Red and Blue Light LED Therapy produced quicker results for the treatment of acne than the application of Blue Light alone.