Clean or not clean: Is Vaseline bad for chapped lips? Short answer: No. When you apply Vaseline to your lips, the petroleum jelly acts as a protective barrier and prevents moisture from escaping. It's not going to add moisture.
Vaseline is known as an occlusive, which means it can hold in moisture rusted Source.
If you use Vaseline on your lips before they’re dry and chapped, you may be able to stave off dryness. However, petroleum jelly isn’t all that effective at restoring moisture once it’s been lost.
Vaseline can feel heavy and slippery on the lips.
Vaseline may clog pores around the mouth.
Vaseline is a by-product of petroleum, a fossil fuel, so it’s not very eco-friendly.
Yeah, I've heard it, too. During UV exposure, Vaseline darkens our lips. Before going to bed, I still use it on my lips, but my friends tell me it darkens my lips. But I just use it at night, so I don't have any issues right now.