Dehydrated skin is a condition of lack of water in the skin. Unlike dry skin it’s not a skin type but a temporary condition that can affect anyone, regardless of skin type. Oily and combination skin can get dehydrated too. Causes of Dehydrated Skin Environmental Factors: Cold weather, central heating and air con can dry out the skin. Lifestyle Choices: Not drinking enough water, too much caffeine or booze and a rubbish diet can dehydrate you. Skincare Habits: Over cleansing or using harsh products can disrupt the skin’s moisture balance. Stress and Lack of Sleep: These can compromise the skin’s ability to retain moisture.