Did you know that the surprising secret to jello skin lies in your well-loved tub of petroleum jelly? "Slugging works by reducing the transepidermal water loss from your skin. It repairs dry, dehydrated skin and helps it heal and recover. Start by cleansing, use actives with humectants like hyaluronic acid, and seal it in with an occlusive agent that has petroleum jelly," explains dermatologist Dr. Geetika Mittal Gupta. But this trend isn’t for everyone. "Avoid it if you have acne-prone skin—using an occluding agent can potentially block your pores, making your acne worse," she adds.