structure of healthy skin barrier on white background.

skin barrier sebum structure healthy dehydrated moisture face protect corneocyte horny cell bricks mortar layer aging stratum corneum epidermis lost stimulation bacteria lipids ceramide cholesterol fatty acids allergen aesthetic esthetic dermatology physiological intercellular restoration vector beauty body hydration care virus ultraviolet rays reduce medical biology irritated flaky red tight oily natural moisturizing factor cornified lipid envelope corneodesmosome anatomy isolated white background arrangement cells dehydration uva uvb concept background structure bacteria