"[Blue] Light gets at the core of what causes acne eruptions: P. acnes, the bacterial responsible for causing acne inflammation, pumps out tiny molecules called porphyrins. When those porphyrin are exposed to certain wavelengths of light, they produce free radicals that kill the bacteria. Without P. acnes around to cause inflammation, acne clears up." American Academy of Dermatology
In addition, David Olszewski, co-author of “ Light Years Ahead” found that skin heals almost 200% faster when exposed to red light.
That makes the most powerful acne treatment a combination of bacteria-killing blue lights and skin-healing red lights.
Blue Light Acne Treatment