Dehydrated skin is a condition when skin isn’t holding enough water to function at a healthy level. Dehydration or dryness can become dull, itchy, flaky and feel tight. Skin tone and complexion may appear uneven, and fine lines are more noticeable . Dehydrated skin can appear dry, but is not the same as having dry skin as even oily skin can be dehydrated. Dehydrated skin lacks water, dry skin lacks natural oils.