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Background: Until recently, the removal of melanocytic nevi has been performed with a CO2 laser or Er:YAG laser. These lasers have been useful for removing affected spots. However, enlargement of spots or some sequelae, including depressed or hypertrophic scars, could develop as unwanted results. The Q-switched Nd:YAG laser has been used to remove deep-seated melanocytes, such as Ota nevus or tattoos. However, there have been no previous experiments performed to test the efficacy and safety of this laser treatment for melanocytic nevi. Objective: The objective of this study was to investigate the efficacy and safety of the 1,064 nm Q-switched Nd:YAG laser for removing melanocytic nevi,including congenital nevomelanocytic and acquired nevomelanocytic nevi. Methods: Two thousand and sixty four Korean patients with small melanocytic nevi were treated with a Q-switched Nd:YAG laser from 2005 to 2009. High-resolution photographs were taken in identical lighting and positions before and after the six weeks of treatment to observe the procedural efficacy. Results: About 70% of the nevi treated using a 1,064 nm Q-switched Nd:YAG laser were completely removed after one session. The other 30%were completely treated within three sessions. The appearance of sequelae such as hollow scars noticeably decreased compared to the results seen in CO2 or Er:YAG laser treatments. Conclusion: Use of the 1,064 nm Qswitched Nd:YAG laser is a safe and effective treatment modality for melanocytic nevi.

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