There are two main kinds of visible light therapy used in clinical settings: blue light and red light. Each has a specific use, and, while they both help acne, each has different benefits.
Blue light therapy
Blue light therapy is the type of light therapy most commonly used to address acne breakouts.
The wavelength of blue light has an antimicrobial effect, making it effective at killing several types of bacteria that can collect in your pores and oil glands and cause breakouts.
Blue light therapy also helps condition your skin, getting rid of free radicals that oxidize and age your face. The treatment also has anti-inflammatory benefits, which decreases other symptoms of acne, such as redness.
Red light therapy
Red light therapy doesn’t have the same antibacterial effects of blue light therapy, but it can still be effective.
Red light therapy helps promote healing and may work to decrease the visibility of acne scarring. It also has anti-inflammatory capabilities.
Red light therapy works deep below the surface of your skin to help soothe and repair tissue. If your acne is caused by a chronic skin condition, red light therapy might be the choice for you.