So many things that can cause dehydrated skin. Our skin gets stripped of moisture by air conditioning, the weather, lack of sleep, not drinking enough water, too-hot showers, using stripping skin care products and not following a good skin care routine.
All skin types can become dehydrated - yes, even oily skin - because it's caused by a lack of water within the skin. Remember that this is a skin condition and not a skin type. So, if the air around is dry or windy, moisture evaporates from your skin.
According to the Simple Skincare website;