Dry skin is a skin type. If you have less protective oil in the skin cells it leaves a tight, scaly sensation. A common problem among mature skin, dryness can also be caused by a hormone imbalance, an underactive thyroid, untreated dehydrated skin or simply genetic.
Dehydrated skin is a skin condition. In other words, it’s temporary and more treatable than dry skin. Dehydration is often caused by external elements such as weather or harsh products. Dehydrated skin commonly feels flaky, loose and itchy. It can be caused by over exfoliating, poor diet (i.e. not eating enough water-rich vegetables, too much caffeine and alcohol intake), harsh cleansers, cold weather, sun exposure and other environmental factors.