Abstract
The light spectrum of intense pulsed light (IPL) comprises visible to near-infrared light. It has been widely employed in the field of aesthetics for approximately 30 years. However, several studies have demonstrated the appearance of various undesirable biomarkers on the skin after IPL irradiation, which remain elucidated. We reviewed the evolving concepts and explored the potentially harmful effects of IPL that may have been neglected in the past. Increased levels of reactive oxidative stress, p53, p16, proliferating cell nuclear antigen, interleukin-6, C-reactive protein, and cleaved caspase 3 and decreased albumin levels in human or mouse skin have been observed after IPL treatment. Visible and infrared light can exert harmful and beneficial effects on human skin. If perform improperly, IPL treatment may lead to cellular senescence, photoaging, photocarcinogenesis, thermal aging, and inflammaging. Further studies are required to verify the significance of the changes in the relevant biomarkers. The selection of treatment candidates, optimal parameters, and standardized protocols for IPL therapy are necessary.
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