Hypopigmentation occurred after Er

YAG laser resurfacing

Eul Sang Hwang, Sang Hyuk Woo, Hwan Tae Sung, Soo Nam Kim, Young Chul Kye

Research output: Contribution to journalArticle

Abstract

Background: Hypopigmentation is one of the complications developed after laser resurfacing. There have been few data about hypopigmentation developed after Er:YAG laser resurfacing, especially in darker skin. Objective: The objective of this study was to assess the clinical and histopathologic features of hypopigmentation developed after Er:YAG laser resurfacing. Methods: One hundred and ninety patients have been included in this study. Ninety seven patients were treated with short pulsed Er:YAG laser, 2mm spot sized handpiece at the setting of 12.5-15.0 J/cm2. Fifty two patients were treated with variable pulsed Er:YAG laser, 5 mm spot sized handpiece at the setting of 7.0-7.5 J/cm2 and 7 msec pulse duration. Forty one patients were treated with dual mode Er:YAG laser, 4 mm spot sized scanner at the setting of 17.5 J/cm2 ablation mode and 3.15 J/cm2 coagulation mode. Incidence, time of onset, duration of hypopigmentation were evaluated throughout the medical charts and serially checked photographs. Skin biopsy was performed in four patients at the hypopigmentation site for histopathologic and electron microscopic examinations with informed consents. Results: Hypopigmentation was observed in twenty six patients; eight in short pulsed Er:YAG laser, eight in variable pulsed Er:YAG laser, ten in dual mode Er:YAG laser. According to the time of onset of hypopigmentation, twelve patients developed hypopigmentation within one month, five patients in two months, three patients within three months, three patients within four months, two patients within five months, and one patient within six months. Twenty out of twenty six patients recovered skin coloration within six months, and two patients within twelve months. On the other hand, four patients had persisted hypopigmentation for more than one year. Melanosome appeared to be decreased but melanocytes appeared to be present in normal numbers on the histopathologic and electron microscopic examinations. Conclusion: Although hypopigmentation is one of the frequent complicaions of Er:YAG laser resurfacing, it is temporary in most cases. Thermal damage due to long pulse duration of laser seems to be a very important factor in inducing hypopigmentation.

Original languageEnglish
Pages (from-to)833-838
Number of pages6
JournalKorean Journal of Dermatology
Volume42
Issue number7
Publication statusPublished - 2004 Jul 1

Fingerprint

Hypopigmentation
Solid-State Lasers
Skin
Lasers
Electrons
Melanosomes
Melanocytes

Keywords

  • Erbium:YAG laser resurfacing
  • Hypopigmentation

ASJC Scopus subject areas

  • Dermatology

Cite this

Hwang, E. S., Woo, S. H., Sung, H. T., Kim, S. N., & Kye, Y. C. (2004). Hypopigmentation occurred after Er: YAG laser resurfacing. Korean Journal of Dermatology, 42(7), 833-838.

Hypopigmentation occurred after Er : YAG laser resurfacing. / Hwang, Eul Sang; Woo, Sang Hyuk; Sung, Hwan Tae; Kim, Soo Nam; Kye, Young Chul.

In: Korean Journal of Dermatology, Vol. 42, No. 7, 01.07.2004, p. 833-838.

Research output: Contribution to journalArticle

Hwang, ES, Woo, SH, Sung, HT, Kim, SN & Kye, YC 2004, 'Hypopigmentation occurred after Er: YAG laser resurfacing', Korean Journal of Dermatology, vol. 42, no. 7, pp. 833-838.
Hwang ES, Woo SH, Sung HT, Kim SN, Kye YC. Hypopigmentation occurred after Er: YAG laser resurfacing. Korean Journal of Dermatology. 2004 Jul 1;42(7):833-838.
Hwang, Eul Sang ; Woo, Sang Hyuk ; Sung, Hwan Tae ; Kim, Soo Nam ; Kye, Young Chul. / Hypopigmentation occurred after Er : YAG laser resurfacing. In: Korean Journal of Dermatology. 2004 ; Vol. 42, No. 7. pp. 833-838.
@article{7c3bdbc322ff401ba4c418cea1a2eac3,
title = "Hypopigmentation occurred after Er: YAG laser resurfacing",
abstract = "Background: Hypopigmentation is one of the complications developed after laser resurfacing. There have been few data about hypopigmentation developed after Er:YAG laser resurfacing, especially in darker skin. Objective: The objective of this study was to assess the clinical and histopathologic features of hypopigmentation developed after Er:YAG laser resurfacing. Methods: One hundred and ninety patients have been included in this study. Ninety seven patients were treated with short pulsed Er:YAG laser, 2mm spot sized handpiece at the setting of 12.5-15.0 J/cm2. Fifty two patients were treated with variable pulsed Er:YAG laser, 5 mm spot sized handpiece at the setting of 7.0-7.5 J/cm2 and 7 msec pulse duration. Forty one patients were treated with dual mode Er:YAG laser, 4 mm spot sized scanner at the setting of 17.5 J/cm2 ablation mode and 3.15 J/cm2 coagulation mode. Incidence, time of onset, duration of hypopigmentation were evaluated throughout the medical charts and serially checked photographs. Skin biopsy was performed in four patients at the hypopigmentation site for histopathologic and electron microscopic examinations with informed consents. Results: Hypopigmentation was observed in twenty six patients; eight in short pulsed Er:YAG laser, eight in variable pulsed Er:YAG laser, ten in dual mode Er:YAG laser. According to the time of onset of hypopigmentation, twelve patients developed hypopigmentation within one month, five patients in two months, three patients within three months, three patients within four months, two patients within five months, and one patient within six months. Twenty out of twenty six patients recovered skin coloration within six months, and two patients within twelve months. On the other hand, four patients had persisted hypopigmentation for more than one year. Melanosome appeared to be decreased but melanocytes appeared to be present in normal numbers on the histopathologic and electron microscopic examinations. Conclusion: Although hypopigmentation is one of the frequent complicaions of Er:YAG laser resurfacing, it is temporary in most cases. Thermal damage due to long pulse duration of laser seems to be a very important factor in inducing hypopigmentation.",
keywords = "Erbium:YAG laser resurfacing, Hypopigmentation",
author = "Hwang, {Eul Sang} and Woo, {Sang Hyuk} and Sung, {Hwan Tae} and Kim, {Soo Nam} and Kye, {Young Chul}",
year = "2004",
month = "7",
day = "1",
language = "English",
volume = "42",
pages = "833--838",
journal = "Korean Journal of Dermatology",
issn = "0494-4739",
publisher = "Korean Dermatological Association",
number = "7",

}

TY - JOUR

T1 - Hypopigmentation occurred after Er

T2 - YAG laser resurfacing

AU - Hwang, Eul Sang

AU - Woo, Sang Hyuk

AU - Sung, Hwan Tae

AU - Kim, Soo Nam

AU - Kye, Young Chul

PY - 2004/7/1

Y1 - 2004/7/1

N2 - Background: Hypopigmentation is one of the complications developed after laser resurfacing. There have been few data about hypopigmentation developed after Er:YAG laser resurfacing, especially in darker skin. Objective: The objective of this study was to assess the clinical and histopathologic features of hypopigmentation developed after Er:YAG laser resurfacing. Methods: One hundred and ninety patients have been included in this study. Ninety seven patients were treated with short pulsed Er:YAG laser, 2mm spot sized handpiece at the setting of 12.5-15.0 J/cm2. Fifty two patients were treated with variable pulsed Er:YAG laser, 5 mm spot sized handpiece at the setting of 7.0-7.5 J/cm2 and 7 msec pulse duration. Forty one patients were treated with dual mode Er:YAG laser, 4 mm spot sized scanner at the setting of 17.5 J/cm2 ablation mode and 3.15 J/cm2 coagulation mode. Incidence, time of onset, duration of hypopigmentation were evaluated throughout the medical charts and serially checked photographs. Skin biopsy was performed in four patients at the hypopigmentation site for histopathologic and electron microscopic examinations with informed consents. Results: Hypopigmentation was observed in twenty six patients; eight in short pulsed Er:YAG laser, eight in variable pulsed Er:YAG laser, ten in dual mode Er:YAG laser. According to the time of onset of hypopigmentation, twelve patients developed hypopigmentation within one month, five patients in two months, three patients within three months, three patients within four months, two patients within five months, and one patient within six months. Twenty out of twenty six patients recovered skin coloration within six months, and two patients within twelve months. On the other hand, four patients had persisted hypopigmentation for more than one year. Melanosome appeared to be decreased but melanocytes appeared to be present in normal numbers on the histopathologic and electron microscopic examinations. Conclusion: Although hypopigmentation is one of the frequent complicaions of Er:YAG laser resurfacing, it is temporary in most cases. Thermal damage due to long pulse duration of laser seems to be a very important factor in inducing hypopigmentation.

AB - Background: Hypopigmentation is one of the complications developed after laser resurfacing. There have been few data about hypopigmentation developed after Er:YAG laser resurfacing, especially in darker skin. Objective: The objective of this study was to assess the clinical and histopathologic features of hypopigmentation developed after Er:YAG laser resurfacing. Methods: One hundred and ninety patients have been included in this study. Ninety seven patients were treated with short pulsed Er:YAG laser, 2mm spot sized handpiece at the setting of 12.5-15.0 J/cm2. Fifty two patients were treated with variable pulsed Er:YAG laser, 5 mm spot sized handpiece at the setting of 7.0-7.5 J/cm2 and 7 msec pulse duration. Forty one patients were treated with dual mode Er:YAG laser, 4 mm spot sized scanner at the setting of 17.5 J/cm2 ablation mode and 3.15 J/cm2 coagulation mode. Incidence, time of onset, duration of hypopigmentation were evaluated throughout the medical charts and serially checked photographs. Skin biopsy was performed in four patients at the hypopigmentation site for histopathologic and electron microscopic examinations with informed consents. Results: Hypopigmentation was observed in twenty six patients; eight in short pulsed Er:YAG laser, eight in variable pulsed Er:YAG laser, ten in dual mode Er:YAG laser. According to the time of onset of hypopigmentation, twelve patients developed hypopigmentation within one month, five patients in two months, three patients within three months, three patients within four months, two patients within five months, and one patient within six months. Twenty out of twenty six patients recovered skin coloration within six months, and two patients within twelve months. On the other hand, four patients had persisted hypopigmentation for more than one year. Melanosome appeared to be decreased but melanocytes appeared to be present in normal numbers on the histopathologic and electron microscopic examinations. Conclusion: Although hypopigmentation is one of the frequent complicaions of Er:YAG laser resurfacing, it is temporary in most cases. Thermal damage due to long pulse duration of laser seems to be a very important factor in inducing hypopigmentation.

KW - Erbium:YAG laser resurfacing

KW - Hypopigmentation

UR - http://www.scopus.com/inward/record.url?scp=4644360064&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4644360064&partnerID=8YFLogxK

M3 - Article

VL - 42

SP - 833

EP - 838

JO - Korean Journal of Dermatology

JF - Korean Journal of Dermatology

SN - 0494-4739

IS - 7

ER -