Complications and Adverse Outcomes from Laser and Light Source Treatments

Conclusions

• Most laser and light-source complications appear to result from excessive thermal injury, overly aggressive settings, inadequate cooling, poor patient selection, or operator error.
• Short-term reactions such as erythema, edema, and purpura are common and usually self-limited, but patients should be warned about them in advance.
• Medium-term complications can include pigmentary changes, burns, delayed healing, and infection, especially when treating unsuitable conditions or repeating treatment too aggressively.
• Improper treatment of melasma or other pigmentary disorders with lasers can worsen the condition rather than improve it.
• Sedation may permit higher energies, but this increases the risk of ulceration, blistering, and scarring if not used very cautiously.
• Even effective vascular laser treatment can cause temporary ulceration or other tissue injury, so close monitoring during treatment is important.
• Aggressive CO2 resurfacing can trigger viral reactivation or reveal complications such as warts, underscoring the need for antiviral precautions in oral or facial areas.
• Post-procedure infections after fractional laser treatments can occur but may resolve with prompt topical antibiotic therapy.
• Pigmentary complications after tattoo or pigment treatment may represent post-inflammatory hyperpigmentation or color shift, and may require switching wavelengths or using different lasers.
• Long-term adverse events, especially scars and ocular injury, are the most serious complications and must be actively prevented.
• Eye protection and reduced settings are essential when treating periorbital, neck, or other high-risk areas because these regions respond differently from the face.
• Complication rates can be reduced by knowing the device well, starting conservatively, using cooling, selecting patients carefully, and training the whole team thoroughly.