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Skin hyperpigmentation index in melasma: A complementary method to classic scoring systems.

Kristine Heidemeyer1, Simone Cazzaniga1,2, Laurence Feldmeyer1

  • 1Department of Dermatology, Inselspital University Hospital of Bern, University of Bern, Bern, Switzerland.

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The new Skin Hyperpigmentation Index (SHI) accurately measures melasma severity and shows better reliability among doctors than existing scores. This index offers a precise, cost-effective tool for tracking melasma treatment progress.

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Area of Science:

  • Dermatology
  • Medical Imaging
  • Clinical Assessment

Background:

  • Melasma is a relapsing skin condition significantly impacting quality of life.
  • Objective measurement scores are needed for precise patient follow-up and therapy response assessment in melasma.

Purpose of the Study:

  • To validate the Skin Hyperpigmentation Index (SHI) against established melasma scoring systems.
  • To demonstrate SHI's superior inter-rater reliability.
  • To develop SHI mapping for integration into common melasma scores.

Main Methods:

  • Five dermatologists calculated SHI and standard melasma scores.
  • Inter-rater reliability was assessed using intraclass correlation coefficient (ICC).
  • Concordance was evaluated with Kendall correlation coefficient.

Main Results:

  • SHI demonstrated strong concordance with MASI-Darkness (0.48), MSI-Pigmentation (0.45), and MSS (0.6).
  • Mapping SHI using a step function improved inter-rater reliability for MASI-Darkness (ICC difference 0.22) and MSI-Pigmentation (ICC difference 0.19).
  • This mapping resulted in excellent agreement.

Conclusions:

  • The Skin Hyperpigmentation Index (SHI) is a valuable, time- and cost-efficient tool for monitoring melasma patients.
  • SHI shows strong concordance with established scores and superior inter-rater reliability.
  • It is suitable for both clinical studies and routine practice for assessing melasma therapies.