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Related Experiment Videos

Paradoxical hypertrichosis after laser epilation.

Abdulmajeed Alajlan1, Jerry Shapiro, Jason K Rivers

  • 1Division of Dermatology, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada.

Journal of the American Academy of Dermatology
|June 21, 2005
PubMed
Summary
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Paradoxical hypertrichosis, or increased hair growth, after laser hair removal is a rare but real adverse effect. This study found it occurred in 0.6% of patients treated with an alexandrite laser.

Area of Science:

  • Dermatology
  • Medical Aesthetics
  • Laser Treatments

Background:

  • Laser hair removal is a common procedure for unwanted hair.
  • Some patients report paradoxical increased hair growth after laser epilation.
  • This retrospective study investigated the prevalence of this rare side effect.

Observation:

  • A single center reviewed 489 patients undergoing laser hair removal with a long-pulsed alexandrite laser over 4 years.
  • Three patients (0.6%) reported increased hair growth post-treatment.
  • Clinical photographs and patient history confirmed laser-induced hypertrichosis in these cases.

Findings:

  • The incidence of post-laser hypertrichosis was 0.6% (95% CI: 0.01-1.9%).
  • A trend suggested higher occurrence in darker skin types (IV) and with black hair.

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  • The small sample size limited statistical analysis of contributing factors.

    • Implications:

    • Post-laser hypertrichosis is a documented, albeit infrequent, complication of laser hair removal.
    • Awareness of this paradoxical effect is important for clinicians and patients.
    • Further research is needed to identify risk factors and preventive strategies.