Ultraviolet exposure influences laser-induced wounds, scars, and hyperpigmentation: a murine study

Area of Science:

• Dermatology
• Photomedicine
• Laser Surgery

Background:

• Laser therapy is a primary treatment for facial vascular lesions.
• Facial lesions are frequently exposed to sunlight, necessitating investigation into UV radiation's effects.
• Understanding UV influence is crucial for optimizing laser treatment safety and efficacy.

Purpose of the Study:

• To investigate the impact of preoperative and postoperative ultraviolet (UV) irradiation on laser-induced side effects.
• To evaluate how UV exposure influences wound healing, scarring, and pigmentation following laser treatment.

Main Methods:

• Hairless mice were treated with a copper vapor laser at varying intensities.
• Simulated solar UV radiation was administered either pre- or post-laser treatment.
• Macroscopic, histologic, and biochemical methods assessed laser-induced wounds, scars, and hyperpigmentation.

Main Results:

• Preoperative UV exposure enlarged laser-induced wounds and texture changes at certain laser intensities.
• Postoperative UV exposure led to increased fibrosis, hyperpigmentation, and bulging infiltration, resulting in poor cosmetic appearance.
• UV irradiation post-laser treatment caused slower healing and constricted skin damage.

Conclusions:

• Ultraviolet exposure, both before and after copper vapor laser treatment, elevates the risk of dermatological side effects.
• Postoperative UV irradiation poses a significant risk for adverse cosmetic outcomes.
• Minimizing UV exposure around the time of laser treatment is recommended to reduce complications.