La piel de gallina es una manifestación de frío de la piel humana, fundamentalmente debida al complejo pilomotor. La piel está compuesta de tres capas, cada una de las cuales tiene su propia función. Estas capas son: \n* La epidermis o capa exterior. \n* La dermis. \n* La hipodermis. Es la implicada en el fenómeno de la piel de gallina.

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Goosebumps, goose pimples or goose flesh are the bumps on a person's skin at the base of body hairs which may involuntarily develop when a person is cold or experiences strong emotions such as fear, euphoria or sexual arousal. The medical term for the effect is cutis anserina or horripilation. The formation of goose bumps in humans under stress is considered by some to be a vestigial reflex; some believe its function in human ancestors was to raise the body's hair, making the ancestor appear larger and scaring off predators. The reflex of producing goose bumps is known as arasing, piloerection, or the pilomotor reflex. It occurs in many mammals besides humans; a prominent example is porcupines, which raise their quills when threatened, or sea otters when they encounter sharks or other predators.

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