A population-based study of the stratum corneum moisture

Area of Science:

• Dermatology
• Epidemiology
• Human Physiology

Background:

• The stratum corneum (SC) is crucial for skin barrier function and water regulation.
• Previous research lacked large-scale epidemiological data on SC properties and influencing factors.
• This study investigates SC properties in a Brazilian population.

Purpose of the Study:

• To quantify the relationship between SC functional properties and various demographic, environmental, and self-perceived variables.
• To identify key factors affecting skin barrier function and hydration in a large cohort.
• To correlate objective SC measurements with subjective skin condition perception.

Main Methods:

• A cross-sectional study of 1,339 individuals from a rural Brazilian population.
• Measurement of SC moisture using Corneometer® CM820.
• Assessment of environmental exposures, cosmetic use, and physiological/epidemiological data, including self-perception questionnaires.

Main Results:

• Significant associations found between SC moisture and sex, age, high sun exposure, and sunscreen use frequency.
• Self-reported race and obesity showed significant effects on SC moisture in specific body sites.
• Dry skin self-perception strongly correlated with objective SC moisture measurements.

Conclusions:

• Demographic factors (sex, age, race) and environmental exposures (sun, sunscreen use) significantly impact SC moisture.
• Objective skin hydration measurements align with individuals' self-perceived skin dryness.
• Findings provide epidemiological insights into skin barrier function in a diverse population.