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Porphyrins are light-sensitive molecules produced by acne bacteria. When exposed to blue light, they generate reactive oxygen that destroys the bacteria from within—the basis of blue-light acne therapy.
Porphyrins are naturally fluorescent, light-sensitive compounds produced as a by-product by the acne-causing bacterium C. acnes as it metabolises sebum inside the follicle. This quirk of bacterial biology is what makes drug-free light treatment of acne possible.
When porphyrins absorb blue light at around 415nm, they become excited and generate reactive oxygen species inside the bacterial cell—a burst of oxidative stress that destroys the bacteria from within, with no antibiotic and no resistance. Because blue light is a short wavelength it stays superficial, concentrating the effect right where the bacteria live in the sebaceous follicle. The same porphyrin chemistry is amplified in photodynamic therapy, where an added photosensitiser boosts the reactive-oxygen effect.
For clinics, porphyrins are the reason blue-light and PDT acne treatments can be offered as clean, drug-free alternatives.
Acne bacteria make their own light-sensitive Achilles' heel—blue light flips it into a self-destruct switch.
Sebaceous glands produce sebum, the skin's natural oil.
The photodynamic reaction is a photosensitiser plus light plus oxygen producing reactive o
Ozone (O₃) is an antibacterial gas generated at the skin surface by high-frequency current
Porphyrins are light-sensitive molecules made by acne bacteria; blue light excites them to generate reactive oxygen that destroys the bacteria—the drug-free basis of blue-light and photodynamic acne therapy.
