Oily skin does not mean hydrated
Oily skin is not synonymous with hydrated skin. Oily skin refers to a skin type that produces excessive sebum, making the skin shiny and susceptible to the onset of acne and blackheads. On the other hand, hydration is about the level of water in the skin.
It is possible to have oily skin that is also dehydrated, meaning that the skin lacks water, despite the presence of excess sebum. In this case, it is important to use hydrating products that provide water to the skin without increasing sebum production.