Complications and Clinical Endpoints in Energy-Based Device Treatments

Conclusions

• Safe and effective use of lasers and other energy-based devices depends more on recognizing proper tissue endpoints than on blindly following preset settings.
• Many complications are preventable with correct technique, appropriate cooling, correct device positioning, and careful attention to skin type and patient risk factors.
• Shorter-wavelength vascular lasers such as 532 nm KTP are useful but less forgiving in darker skin, while 1064 nm Nd:YAG offers deeper penetration but has a narrower safety margin and is not ideal for beginners.
• Hair removal complications include paradoxical hypertrichosis, temporary hyperpigmentation from poor cooling tip technique, and higher risk in patients with darker skin, where Nd:YAG is generally preferred.
• Post-inflammatory hyperpigmentation is a major concern after resurfacing in darker skin, and pretreatment with hydroquinone does not appear to reliably prevent it.
• Oral tranexamic acid appears to be a more effective adjunct than topical therapy for pigmentary disorders such as melasma and PIH.
• Chrysiasis from prior gold exposure is a rare but important history point because laser treatment can produce difficult-to-treat blue-gray discoloration.
• Fully ablative CO2 and Er:YAG resurfacing can produce dramatic rejuvenation, but the benefit comes with prolonged erythema, infection risk, and possible hypopigmentation or scarring.
• Recovery after aggressive resurfacing can be improved by preconditioning the skin and by rapid recognition and treatment of infections or other adverse reactions.
• Pain after the first postoperative day, marked itching, or sudden worsening redness after resurfacing should raise concern for infection and prompt immediate evaluation and treatment.
• Standardized prophylaxis and prompt antiviral coverage are emphasized, while antibiotics should be reserved more selectively rather than given routinely to everyone.
• Eruptive keratoacanthomas can occur after resurfacing and may resolve or respond to intralesional or topical 5-FU, so they should not be routinely excised.
• Microneedling RF and microfocused ultrasound can cause serious injury when used improperly, showing that operator skill and correct depth control are crucial for safety.
• Uneven coupling, air pockets, too much gel, or superficial energy delivery are key mechanisms behind ultrasound-related burns, necrosis, and fat atrophy.
• Newer ultrasound systems and safer treatment depths may reduce but do not eliminate risks such as nerve palsy or fat loss.
• Cryolipolysis is generally safe with mostly temporary side effects, but paradoxical adipose hyperplasia is a rare permanent complication that may require surgical correction.
• Overall, the presentation argues that energy-based device outcomes are highly operator-dependent and that clinicians must understand endpoints and individualized risk rather than relying on a one-size-fits-all approach.