Modulated dual mode erbium/CO2 lasers for the treatment of acne scars.

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Abstract
Treatment of acne scarring is a challenging problem for dermatologists and cosmetic surgeons. Combining skin resurfacing with other procedures, especially the use of filling agents, has proven to be superior to the use of a single modality. Carbon dioxide laser resurfacing has been popularized for the treatment of acne scarring, but post operative morbidity with stimulation of active acne has been problematic. Conventional erbium resurfacing is effective when sufficient fluences are used, particularly when treating relatively superficial acne scars. Deeper resurfacing for acne scars is difficult with erbium lasers, owing to bleeding and heavy exudation, which decreases ablation efficiency and makes 'end points' difficult to visualize. The newer modulated hybrid erbium/CO2 lasers (Derma K, ESC Sharplan, Yokneam, Israel) produce efficient ablation by the reduction of bleeding, yet at the same time incur little post operative morbidity. This is suitable for treating deeper acne scars, and may be combined with other procedures, e.g. fat grafting. Of particular importance is the lack of acne stimulation associated with the use of the erbium/CO2 hybrid lasers.

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