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Summary

The number of closed polygons (NCP) per square millimeter is a reliable measure for skin topography, showing distinct aspects not captured by standard roughness parameters. This reproducible metric is proposed for dermatological research and practice.

Keywords:
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Area of Science:

  • Dermatology
  • Biophysics
  • Image Analysis

Background:

  • Skin surface topography is characterized by lines, wrinkles, and scales forming polygonal networks.
  • Current skin surface roughness measurements lack clear anatomical equivalents.
  • The relationship between roughness parameters and skin topography features remains unclear.

Purpose of the Study:

  • To investigate the reliability of the number of closed polygons (NCP) per measurement field as a parameter for skin surface topography.
  • To analyze the relationship between skin surface roughness parameters and NCP across different age groups.

Main Methods:

  • Skin images of 38 subjects (children, younger adults, older adults) were captured using VisioScan VC98.
  • The number of closed polygons (NCP) was counted by three independent researchers.
  • Interrater reliability and correlations between NCP, roughness parameters, and age were calculated.

Main Results:

  • Mean NCP/mm² was 3.1 in children, 1.0 in younger adults, and 1.0 in older adults.
  • A negative correlation was observed between NCP/mm² and age.
  • Measured roughness parameters showed a positive association with age, with a weak relationship to NCP/mm².

Conclusions:

  • The number of closed polygons (NCP)/mm² is a reproducible parameter for characterizing skin surface topography.
  • NCP/mm² offers distinct insights into the cutaneous profile beyond established roughness parameters.
  • NCP/mm² is proposed as a valuable additional parameter for dermatological research and practice.