Epidermal and dermal hydration in relation to skin color parameters

Area of Science:

• Dermatology
• Skin Physiology
• Biophysics

Background:

• Previous research focused on stratum corneum hydration.
• This study investigates epidermal and dermal hydration in relation to skin color parameters.
• Explores differences between sexes regarding skin hydration and color.

Purpose of the Study:

• To investigate linkages between skin color parameters and skin hydration.
• To focus on epidermal and dermal hydration, unlike prior studies.
• To analyze these relationships in both males and females.

Main Methods:

• Thirty adults (16 female) aged 24.3 ± 0.6 years participated.
• Evaluated melanin index (MI), erythema index (EI), Individual Typology Angle (ITA), and tissue dielectric constant (TDC) at 0.5 mm and 2.5 mm depths.
• Assessed Fitzpatrick skin type (FST) on volar forearms.

Main Results:

• Melanin index (MI) and erythema index (EI) were highly correlated (r=0.800, p<0.001).
• Male skin showed higher MI than females (p<0.01).
• Significant sex-based differences were observed in the correlation between TDC, EI, and MI, indicating differential hydration patterns.

Conclusions:

• Skin color parameters correlate with hydration, with notable sex-based differences.
• Melanin may differentially impact water-holding capacity between sexes.
• Findings may inform dermatological assessments and personalized skincare treatments.