Acne and rosacea patients take note- you must know about proper skin-care and cosmetic usage to successfully manage your sensitive skin. This is the counsel of Dr. Diane Berson, who runs a dermatology practice in New York City. A critical step in reducing skin sensitivity is understanding the importance of the stratum corneum. The stratum corneum is the outermost layer of the skin and is composed of dead, flat skin cells held together by the protein keratin. This skin barrier prevents…