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Journal of the American Academy of Dermatology
Volume 66, n° 4
pages 626-633 (avril 2012)
Doi : 10.1016/j.jaad.2011.08.031
accepted : 12 August 2011
Dermatologic Surgery

Prospective randomized controlled clinical and histopathological study of acne vulgaris treated with dual mode of quasi-long pulse and Q-switched 1064-nm Nd:YAG laser assisted with a topically applied carbon suspension

Jae Yoon Jung, MD a, b, Jong Soo Hong, MD a, b, Chang Ho Ahn, MD a, Ji Young Yoon, MSc b, Hyuck Hoon Kwon, MD a, b, Dae Hun Suh, MD, PhD a, b,
a Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea 
b Acne Research Laboratory, Seoul National University Hospital, Seoul, Korea 

Reprint requests: Dae Hun Suh, Department of Dermatology, Seoul National University Hospital, 28 Yongon-dong, Chongno-gu, Seoul, 110-744, Korea.

Acne treatments using laser and light devices have been reported to have varying degrees of efficacy. However, there has been no study of treatment of acne using a dual mode (quasi-long pulse and Q-switched mode) 1064-nm Nd:YAG laser assisted with a topically applied carbon suspension.


To evaluate the clinical efficacy, safety, and histological changes of new laser treatment method for acne vulgaris.


Twenty-two patients received 3 sessions of quasi-long pulse and Q-switched Nd:YAG laser treatment assisted with a topically applied carbon suspension at 2-week intervals in a randomized split face manner.


At the final visit, the inflammatory acne lesions were reduced on the laser-treated side by 58.6% (P  < .001), but increased on the untreated side by 5%. The noninflammatory acne lesions were reduced on the laser-treated side by 52.4% (P < .001). Sebum output reduction, inflammatory cell and cytokine reductions, a decrease of the thickness of a perifollicular stratum corneum and a full epithelium, and skin rejuvenation effect were found. The histopathologic examination of the acne lesions showed decreased inflammation and immunostaining intensity for interleukin 8, matrix metalloproteinase-9, toll-like receptor-2, and nuclear factor kappa B, and tumor necrosis factor alpha was reduced significantly. No severe adverse reactions were reported. All patients reported mild transient erythema that disappeared in a few hours.


The number of subjects studied was small.


This laser treatment was rapid and effective for treating not only the inflammatory but also the noninflammatory acne lesions when compared with the control side. The histopathologic findings correlated well with the clinical acne grade and treatment response. This novel laser treatment appears to be safe and effective for acne treatment.

The full text of this article is available in PDF format.

Key words : acne, histopathologic examination, Nd:YAG laser, sebum output

Abbreviations used : H&E, HSP, IL, MMP, Nd:YAG, NF-κB, PDL, TGF-β, TLR, TNF-⍺, VAS

 Funding sources: None.
 Conflicts of interest: None declared.

© 2012  American Academy of Dermatology, Inc.@@#104156@@
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