What Is an Occlusive? Why Dry Skin Needs One Over a Serum
An ingredient that sits on the surface and slows water leaving the skin. Petrolatum, waxes, dimethicone, heavier oils and butters.
On the label
Found in balms, night creams and anything described as sealing or locking in.
What it does not mean
It does not mean pore clogging by default, and it does not hydrate on its own. It keeps in what a humectant brought.