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Skin conditions. Skin conditions that can cause itching include: 1  dry skin. 2  eczema â where the skin is dry, red, flaky and itchy. 3  contact dermatitis â inflammation of the skin that occurs when you come into contact with an irritant or allergen (see below).
Causes. Dry skin is one of the most common causes of itchy back skin, states MayoClinic.com. Itchiness may get worse during seasonal changes, when humidity levels fluctuate. Other causes of itchy skin that are less common include disease and allergic reactions.