Dry skin is a term often confused with dehydrated skin. In actual fact, dry skin and dehydrated skin are two very different things.
So, which one are you? It all boils down to the definition; dry skin is a lack of sebum production that stems from genetics and age. Dehydration, on the other hand, has nothing to with oil production and everything to do with a lack of water. Because of this, dry skin is considered a skin type whereas dehydrated skin is a skin concern.