Blue and red light facial and back therapy immediately improved acne symptom better than salicylic acid treatment . “The number of comedones, papules and pustules decreased significantly at the end of the session.”
Treatment Time (seconds)
Irradiance/Power Density (mW/cm^2)
Blue 415-490 nm
Red 630-700 nm
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Researchers said that red and blue light were more effective than salicylic acid treatment because blue added antibacterial and anti-inflammation effects.