What if the skin is dry and itch?

What if the skin is dry and itch?
The temperature is relatively low in winter, the air is dry, make our skin often in the state desiccating, the intersection of skin and several easy pruritus, what serious disease it is though, break out, stand up, let people sit, stand difficult to fit really, what means may we adopt to prevent?

Reason for finding skin pruritus
The skin usually presents pruritus because it is too cold to cause in winter, especially will it be the end autumn and when temperature change obvious, people enter the warm room while being outdoor from a cold one, or while undressing in the evening and sleeping, the skin touches the cold air suddenly, begin pruritus.
External stimulus to lead to the fact skin appear a reason of pruritus too. Stimulate like the dust in the air, has used alkaline stronger soap, has taken the too spicy and amazing food, the clothes next to the skin are chemical fibre products,etc..
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