What causes dry skin?
Dryness is a skin type caused by environmental factors like the sun, pollution and humidity – and sometimes just genetics. Drier skin types often have a weakened protective barrier that has trouble holding onto water and the important lipids that help to hydrate it. You may find that dry skin often doesn’t absorb products such as moisturisers that well (so heavier formulas are needed) and it’s often affected by flaking, tightness and dullness.
Dehydration is not a skin type but a side effect of not having enough water in the body. You can often tell if your skin is dehydrated by the way it absorbs products; dehydrated skin often drinks in moisturisers easily while still feeling like it needs more. It may also feel very tight when you get out of the shower and look flat and dull.