In which skin types can dehydration typically occur?

Dehydration in the skin can affect all skin types, including dry, oily, and combination skin. Dehydration refers to a lack of water in the skin, which can occur regardless of the skin's natural oil content. For instance, dry skin may already have a compromised barrier function, making it more prone to moisture loss. Oily skin may have excess sebum production, but it is still possible for this type to be dehydrated if the skin is not retaining adequate hydration. Combination skin, which includes both oily and dry areas, can also experience dehydration, especially if the skin is not properly moisturized or if there are environmental factors causing moisture loss. Therefore, the correct answer encompasses all skin types, highlighting the importance of hydration across the board in skincare practices.