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Incidence of pigmentation caused by lasers in Asians

Hirotaka Akita, MD et al. presented their study comparing the incidence of post-inflammatory hyperpigmentation (PIH) in three Q-switched lasers, Ruby, Alexandrite and Nd:YAG. The authors found that the Ruby laser had the lowest incidence of post-inflammatory hyperpigmentation (PIH). The Alexandrite laser, on the other hand, had the shortest duration time for PIH to clear and that the Nd:YAG had the longest duration time for PIH to clear. They also found that subjects with melasma had a higher incidence of PIH and the longest duration to clear. The authors attributed the difference in incidence of PIH and durations of clearance of PIH to the penetration depth and the degree of absorption by melanin and hemoglobin. They also concluded that subjects with melasma were more prone to develop PIH.

Posted August 15, 2015

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