The goal of this observational study is to compare objective parameters of skin barrier function between healthy adult women who regularly use UV lamps during nail treatments and women who do not use UV lamps. The main questions it aims to answer are: * Do women who regularly use UV lamps for nail treatments show differences in skin barrier function compared to women who do not use UV lamps? * Are transepidermal water loss, skin hydration, and erythema associated with regular exposure to UV lamps used for nail treatments? * Does the duration of UV lamp use influence skin barrier function parameters? Researchers will compare women who regularly use UV lamps during nail treatments with women who have natural nails and do not regularly expose their hands to UV lamps. Participants will: * Attend a single study visit. * Complete a short questionnaire regarding nail care habits and duration of UV lamp use. * Undergo non-invasive measurements of skin barrier function on the hands, including transepidermal water loss, skin hydration, and erythema assessments.
Age range
18 Years – 50 Years
Sex
FEMALE
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Change in Transepidermal Water Loss (TEWL)
Timeframe: Day 1 (single study visit)
Change in Skin Hydration
Timeframe: Day 1 (single study visit)
Change in Skin Erythema
Timeframe: Day 1 (single study visit)