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Comparison of the efficacy and safety of a picosecond alexandrite laser and a Q- switched alexandrite laser for the treatment of freckles in Chinese patients Yin Yang, MD, Lin Peng, MD, Yiping Ge, MD, Tong Lin, MD Journal of the American Academy of Dermatology Volume 79, Issue 6, Pages (December 2018) DOI: /j.jaad Copyright © 2018 American Academy of Dermatology, Inc. Terms and Conditions
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Fig 1 Photographs of 1 patient before and after treatment: the side of the face randomized to the control (Q-switched alexandrite laser–treated) group before treatment (A) and at 8 weeks after treatment (B), and the side of the face randomized to the experimental (picosecond pulsed alexandrite laser–treated) group before treatment (C) and at 8 weeks after treatment (D). Journal of the American Academy of Dermatology , DOI: ( /j.jaad ) Copyright © 2018 American Academy of Dermatology, Inc. Terms and Conditions
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Fig 2 Reflectance confocal microscopy (RCM) images for 1 patient: image from an area of the patient's face randomized to the control (Q-switched alexandrite laser–treated) group before treatment (A) and at 2 weeks after treatment with a Q-switched alexandrite laser (B) and image from an area of the patient's face randomized to the experimental (picosecond pulsed alexandrite laser–treated) group before treatment (C) and at 2 weeks after treatment (D). A and C, Arrows indicate the many high-refractive melanin particles the stratum spinosum. B, Arrow indicates the decrease in the number of melanin particles and spines of highly refractive dendritic cells in the stratum spinosum after treatment. D, Arrow indicates the decrease in the number of melanin particles in the stratum spinosum after treatment. Journal of the American Academy of Dermatology , DOI: ( /j.jaad ) Copyright © 2018 American Academy of Dermatology, Inc. Terms and Conditions
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