Blue Light Therapy is a non-invasive phototherapy procedure in which light of a specific blue wavelength is applied to the skin or specific areas. This treatment is primarily used to kill bacteria on the skin, reduce inflammation, and help control acne. It is also used in some cases to reduce seasonal affective disorder (SAD). The therapy is generally painless, safe, and provides quick results, and can be done either with a home device or in a clinic. Regular use can be effective in increasing skin radiance, reducing oiliness, and reducing the risk of acne recurrence.