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Skin Barrier (Occlusive Action)
- Molecular classification
- Physical Barrier, Lipid Matrix, Stratum Corneum Structure
01
Overview
The skin barrier, primarily located in the stratum corneum, functions to protect underlying tissues from environmental insults and prevent water loss. Occlusive action refers to the formation of a physical barrier on the skin surface that reduces transepidermal water loss. Common occlusive agents include petrolatum, mineral oils, waxes, and silicones. While beneficial for maintaining hydration and protecting against irritants, overuse or improper use can lead to maceration or enhanced penetration of certain topical agents.
- Other names
- Epidermal BarrierStratum Corneum BarrierOcclusive BarrierMoisture Barrier
02
Mechanism of action
Forms a hydrophobic film on the skin surface, reducing transepidermal water loss and protecting against external irritants. Does not add moisture, but retains existing hydration.
03
Biological functions
Prevention of Transepidermal Water Loss (TEWL)Protection against environmental insultsMaintenance of skin hydrationRegulation of skin permeabilityProtection against irritants and allergens
04
Disease associations
EczemaDry SkinWound HealingScar FormationIrritant Contact DermatitisAllergic Contact Dermatitis
05
Safety considerations
Maceration (overhydration) with prolonged useEnhanced penetration and potential irritation of some topical agentsIncreased risk of bacterial colonization under occlusionPotential for allergic reactions to occlusive ingredients
06
Interacting drugs
Petrolatum
6 more in the full profile.
07
Biomarkers
Transepidermal Water Loss (TEWL) measurementSkin hydration levels (corneometry)Visual assessment of skin dryness/scalingpH of the stratum corneumInflammatory markers (e.g., IL-1) in skin biopsies (research setting)
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