Medical Lasers; Engineering, Basic Research, and Clinical Application 2018; 7(1): 52-54  
Postinflammatory Hyperpigmentation Successfully Treated with 1,064-nm Picosecond-Domain Neodymium:Yttrium-Aluminum-Garnet Laser
Hae-Jin Lee1,2, Seung Hun Lee1, So Young Yoon1, Jong Won Lee1, Young Koo Kim3, Eung Ho Choi2
1Yonsei A&B Clinic of Dermatology, Seoul, Korea, 2Department of Dermatology, Yonsei University Wonju College of Medicine, Seoul, Korea, 3Yonsei Star Skin & Laser Clinic, Seoul, Korea  
Correspondence to: Hae-Jin Lee, Department of Dermatology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju 26426, Korea, Tel.: +82-33-741-1384, Fax: +82-33-748-2650, E-mail: understnd@hanmail.net
Received: June 24, 2018; Accepted: June 25, 2018; Published online: June 30, 2018.
© Korean Society for Laser Medicine and Surgery. All rights reserved.

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Abstract
Postinflammatory hyperpigmentation (PIH) is a reactive hypermelanosis of the skin occurring as a result of variable inflammatory processes, such as trauma, and inflammatory dermatosis. Although topical agents are the first-line treatment of PIH, treatment of PIH remains challenging. In this report, we treated a patient with PIH using picosecond-domain Nd:YAG lasers. After five sessions of 1,064-nm picosecond-domain Nd:YAG laser treatment, the patient presented nearly complete improvement, with no remarkable side effects or recurrence for the duration of 6 months. We suggest that 1,064-nm picosecond-domain Nd:YAG laser can be effectively and safely used to treat pigmented lesions in the dermis, particularly PIH, in Asian patients.
Keywords: Post-inflammatory hyperpigmentation; Picosecond; Nanosecond; Neodymium:yttrium-aluminum-garnet laser


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