Skin that’s oily in some areas (such as the T-zone) and dry or normal in others (such as the cheeks) is typically defined as “combination.”

Dry skin is lacking in natural oils, while dehydrated skin can’t retain enough moisture in its upper layers. Both may feel tight, rough and uncomfortable, with flakes and fine lines.

Redness, irritation, itching, stinging and dehydration are all signs of sensitive or reactive skin—which is often the result of a damaged skin barrier.

Loss of firmness and elasticity, fine lines and wrinkles, and thin or “crepey” skin can occur in more mature skin types, as a result of a natural decrease in skin’s collagen production over time.