If you’ve spent any time researching the "Slugging" trend or looking for a cure for dry skin, you’ve likely run into a wall of conflicting advice. One group of beauty enthusiasts swears by the "glass skin" results of Vaseline, while another group warns that it’s a "breakout in a jar."
So, let’s settle the debate once and for all with science. Does Vaseline actually clog your pores? The answer is more nuanced than a simple yes or no.
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The Science: The "Molecule" Factor
To understand if a product clogs pores (is comedogenic), we have to look at its molecular structure.
The Fact: White Petrolatum (the only ingredient in Vaseline) has a high molecular weight. This means the molecules are physically too large to sink into your pores. Instead of entering the pore and mixing with sebum to create a clog, Vaseline sits firmly on top of the skin’s surface.
According to the official comedogenicity scale (which ranks ingredients from 0 to 5), pure Vaseline scores a 0.
The Verdict: Biologically, Vaseline is non-comedogenic. It cannot "clog" a pore because it cannot get inside one.
If it’s Non-Comedogenic, Why Do People Break Out?
If the molecules are too big to clog pores, why do some people wake up with a pimple after "slugging"? The answer isn't the Vaseline itself—it's what is trapped underneath it.
Vaseline is a world-class occlusive. It creates a literal seal over your skin. While this is great for locking in moisture, it also locks in:
Unwashed Cleanser: Residual soap or oil.
Sweat and Sebum: Natural fluids your skin tries to release.
Old Makeup: Tiny particles you might have missed.
Bacteria: If your face wasn't 100% clean before application.
When these elements are trapped under a heavy seal, they create a breeding ground for acne. Vaseline doesn't cause the clog; it "invites the clog to stay" by not letting it escape.
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Who Should (And Shouldn't) Use Vaseline on Their Face?
Use it if...
You have dry or flaky skin: It will repair your barrier faster than almost anything else.
You live in a cold/dry climate: It protects against "windburn."
You use Retinol: It can help mitigate the "Retinol uglies" (peeling and redness).
Avoid it if...
You have active, cystic acne: Trapping bacteria can worsen inflammation.
You have very oily skin: Your skin already produces enough natural occlusives (sebum).
You live in extreme humidity: Trapping sweat under Vaseline can lead to heat rashes or "sweat-induced" breakouts.
How to Use Vaseline Without Breaking Out: 3 Golden Rules
To get the glow without the acne in 2025, follow this dermatologist-approved protocol:
The "Surgical" Clean: Never apply Vaseline to a face that hasn't been double-cleansed. Ensure every trace of the day is gone.
Avoid Complicated Layers: Don’t layer Vaseline over heavy oils or pore-clogging foundations. Stick to a simple water-based serum or moisturizer underneath.
The Morning Reset: You must wash your face with a gentle cleanser the following morning to remove the occlusive seal and allow your skin to "breathe" during the day.
Summary
Vaseline is a safe, non-comedogenic miracle for many, but it requires a strategic approach. It isn't a moisturizer; it's a protector. As long as you are sealing in clean skin, your pores are safe.
Are you worried that your current cleanser isn't strong enough to prep your skin for Vaseline? I can recommend the best "Double Cleansing" duos for your skin type—would you like to see them?