In Blue Light Therapy, acne sufferers are exposed to a blue light source for 15 minutes twice a week for a month. This light eliminates bacteria that cause acne. It activates molecules called porphyrins produced by the bacterium, which results in the elimination of the bacterium as well as a decrease in the acne.
The Food and Drug Administration (FDA) originally approved this treatment as a cancer treatment. Later in 2002, FDA approved Blue Light Therapy for acne as well.
These are very popular as an alternative treatment and are easily available on Amazon in various models.
Popular Acne Products on Amazon