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petrolát
Vaseline made it famous, but you’ll find petrolatum in other moisturizers too. It’s known as an occlusive, which is an ingredient that forms a barrier on the outermost layer of your skin to hold water in, sort of like a topcoat of nail polish, says Ranella Hirsch, MD, FAAD, a dermatologist in Cambridge, Massachusetts. Petrolatum is a great choice for trapping in the moist air after a steamy shower at night, but it could be too greasy to use during the day. I wouldn’t use it in the morning, because you wouldn’t put makeup over it
