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| Those topics are discussed elsewhere if appropriate. Roughly 80% of the body's epidermal cells are made of keratinocytes, composed of soft protein keratin. The epidermal cells are born in the lowest layer of the epidermis, the basal layer. As these cells rise toward the outer layer, they undergo many changes, including the increase in the amount of keratin they produce. By the time the cells reach the top, they are no longer alive, and are formed entirely of keratin. Signs & Symptoms Dry skin is recognizable by its tight, rough feel and its dull appearance; it is apparent in its upper-most layer, the epidermis. Keratin needs water to keep it pliable and healthy; when there is not enough water, the keratin crumbles and the cells can't stay together. When there's too little water in the outermost layer, it loses flexibility, itches and may crack. Treatment & Prevention If you're like most people, your personal cleansing and bathing habits probably grew out of your childhood and teenage years. These habits can strip your skin of the scanty amounts of moisture and oil that it has. |
| Cosmetics / Moisturizers Glycolic Acid |