| Sumario: | The article focuses on how varying levels of humidity influence skin physiology, barrier function, and overall skin health. Low humidity (below 30% relative humidity) increases transepidermal water loss (TEWL), leading to dehydration, impaired barrier integrity, and conditions such as eczema and psoriasis, necessitating barrier repair and lipid replenishment in treatments. Moderate humidity (40–60% RH) supports optimal skin hydration and barrier function, allowing for balanced skincare approaches. High humidity (above 70% RH) decreases TEWL but can cause overhydration, increased sebum and sweat production, and microbial imbalances that may exacerbate acne and other inflammatory conditions, requiring treatments that manage oil, hydration, and microbiome health. Understanding these humidity-related effects aids professionals in tailoring skincare protocols and product recommendations for diverse environmental conditions.
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