Cryogen‐induced arcuate shaped hyperpigmentation by dynamic cooling device

Sj, Lee; Park, SG; Jm, Kang; Yk, Kim; Kim, Do-Hyung

doi:10.1111/j.1468-3083.2007.02481.x

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…The three reports mentioned above attempted to discuss potential aetiologies for this phenomenon, and they proposed several hypotheses. One hypothesis was device error, where the researchers claimed that it would be impossible for this to be the cause because the laser had numerous built-in safety features to keep it from pulsing beyond defined borders [9][10][11]. Additionally, for device errors, long sequences of clients would be affected, which they had not observed.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, cold-related injuries to darker skin are associated more commonly with hypopigmentation compared with hyperpigmentation [16]. In contrast, other researchers [10,11] had favored the idea that unopposed cooling is the cause for the arc PIH. Such speculation could not be discounted giving the variable factors influencing such adverse effects.…”

Section: Discussionmentioning

confidence: 99%

“…In a 2008 case study involving Korean females ( n = 2), the patients complained of several erythematous, brown, arc‐shaped, and hyperpigmented lesions, which emerged after two LHR sessions (separated by a 4‐week break) with a fractional laser [10]. Hydroquinone cream was provided with a steady fade over 3 months, but neither event was fully resolved.…”

Section: Discussionmentioning

confidence: 99%

“…Hydroquinone cream was provided with a steady fade over 3 months, but neither event was fully resolved. The authors suggested that the aetiology was uncertain, and they speculated that the discoloration was due to cold injury by DCD [10]. Comparable findings were discussed in a US‐based case report in 2003, which, in seven patients, attributed arc‐shaped PIH to “super cooling” [11].…”

Section: Discussionmentioning

confidence: 99%

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Crescent‐Shaped Hyperpigmentation Following Laser Hair Removal: Case Series of Fifteen Patients

Alajlan

2020

Lasers Surg Med

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Background and Objectives: Post-inflammatory hyperpigmentation (PIH) is a common adverse effect of laser hair removal procedures. This case series emphasizes the under-reported crescent-shaped form of PIH that may occur following laser therapy. This case series sought to assess the potential causes of the distinct, crescent-shaped form of PIH that may arise following laser hair removal procedures, and to examine the concept of thermal versus cryogenic damage, which was discovered accidentally due misalignments between laser-cryogen spurts. Study Design/Materials and Methods: A retrospective, multicentre case recruitment was undertaken, involving three laser centers and presented in the form of a case series. The included patients were individuals with crescent-shaped PIH following laser hair removal. Results: Fifteen patients were recruited over 12 months. All patients were treated with the GentleLase system (Candella) with built-in cryogen spurt. Prior to the study, only one patient had suffered from PIH following laser hair removal. Most patients improved partially or completely both with and without the use of bleaching compounds. After testing one machine, it was found that the cryogen spurt was misaligned. It was not located in the circle of the laser beam, thereby leaving a crescent shape of uncooled but laser-treated skin. A trial on one patient with cryogen alone did not cause PIH, whereas a trial with the laser alone caused PIH. Conclusion: The appearance of crescent-shaped marks following PIH is a distinct and uncommon adverse effect associated with laser hair removal procedures. This case series suggests that it arises due to the malfunctioning of the built-in cryogen spurt device, leading to a deficit in cooling a portion of the treated skin, urging checking the built-in cryogen spurt device. Lasers Surg. Med.

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Section: Discussionmentioning

confidence: 99%