The loss of hygroscopic substances resulting from

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- The loss of hygroscopic substances resulting from this damage, decreases skin ability to retain  water. 3) Age of skin (increases skin age) : - decreases hygroscopic components of skin, decreased water retention. - decreases hormone level and sebum so decreases skin lubrication and water retention. - UV exposure: cross linking and skin dryness. Treatment: 1) Moisturizing agents (Chemically softening the keratinous epidermal layer). - Should maintain the water level in stratum corneum above 10 % without super hydration. - Should be independent of environmental conditions. - Shouldn’t cause damage to skin by continous application. - Not irritating and economic. - Stable in cosmetic formulations. 2) Lubricating the skin (smoothing the skin but not hydrate the skin). 3) Occlusives (emollients), prevent moisture evaporation from the skin: A )) Sebum:  not effective barrier against moisture loss from skin. B)) Squalene : reasonably effective barrier. C)) Glycerin : humectant. D)) Petrolatum : the most effective occlusive agent, but not acceptable by patient due to its  oiliness and staining properties. E)) Mineral oils : highly adsorbed better than vegetable oil.
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F)) Bath oil : quite effective especially in high temperature.
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  • Spring '13
  • vgcbhvn
  • dry skin, Salicylic acid, Dandruff

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