Numerous research and studies have shown the redness and swelling that can occur with acne is caused by a type of bacteria that can be killed by exposing your skin to different types of light. Blue light is the most commonly used wavelength, although a combination of blue light and red light also appears to be effective. A combination of blue and red light therapies has been proven effective at treating acne without the high price tag of laser treatments or the side effects of oral medications. The distribution of blue light over the skin’s surface targets acne bacteria, while short wavelengths of red light work to reduce inflammation inside the pore. Red light may also offer the additional benefits of reducing redness in rosacea patients and decreasing fine lines and wrinkles. Light-based therapies can reduce acne blemishes in a series of several treatments. You may experience slight redness or swelling after treatment, though downtime is typically minimal.