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Keratosis pilaris results from the buildup of keratin â a hard protein that protects skin from harmful substances and infection. The keratin forms a scaly plug that blocks the opening of the hair follicle. Usually many plugs form, causing patches of rough, bumpy skin. No one knows exactly why keratin builds up. But it may occur in association with genetic diseases or with other skin conditions, such as atopic dermatitis.
Quick Answer. A protein found in skin, nails, hair and teeth, keratin is responsible for the skin's structural integrity. It also forms a protective barrier on the outer layer of the skin, according to Teens Health. Keratin can be hard, as in the case of fingernails, or soft like skin, says Wikipedia. Continue Reading.