Silicones and Acne: Are Dimethicone and Other Silicones Clogging Your Pores?
Silicones are one of the most controversial ingredient categories in skincare. Search any acne forum and you'll find people swearing that dimethicone destroyed their skin. Search a dermatology resource and you'll find it listed as non-comedogenic. Both sides seem convinced.
So what's actually going on? Are silicones clogging your pores, or are they taking the blame for something else?
What Are Silicones?
Silicones are synthetic polymers made from silicon, oxygen, carbon, and hydrogen. In skincare and cosmetics, they serve as emollients, occlusives, and texture-enhancing agents. They're the reason primers feel silky, foundations glide on smoothly, and moisturizers leave a soft, non-greasy finish.
They're in virtually everything — moisturizers, serums, foundations, primers, sunscreens, hair products, and even some cleansers.
Common Silicones in Skincare
Dimethicone
The most widely used silicone in cosmetics. It creates a breathable barrier on the skin's surface, smooths texture, and helps products spread evenly. You'll find it in a huge percentage of moisturizers and foundations.
Comedogenic rating: 1
Cyclomethicone
A lightweight, volatile silicone that evaporates after application. It gives products a smooth, dry-touch feel without leaving residue.
Comedogenic rating: 0
Cyclopentasiloxane
Similar to cyclomethicone — a volatile silicone used as a carrier in serums and primers. It evaporates quickly and doesn't leave a film.
Comedogenic rating: 0
Dimethiconol
A heavier silicone that provides more conditioning and occlusion than standard dimethicone. More common in hair products than skincare.
Comedogenic rating: 1
Phenyl Trimethicone
Used in color cosmetics for its glossy finish and ability to enhance pigment.
Comedogenic rating: 1
Amodimethicone
A modified silicone primarily found in hair conditioners. It selectively binds to damaged hair.
Comedogenic rating: Generally considered low, though formal testing data is limited.
The Actual Comedogenic Ratings
Here's what the data says:
| Silicone | Comedogenic Rating |
|---|---|
| Dimethicone | 1 |
| Cyclomethicone | 0 |
| Cyclopentasiloxane | 0 |
| Dimethiconol | 1 |
| Phenyl trimethicone | 1 |
Ratings of 0–1 mean non-comedogenic to very slightly comedogenic. For comparison, coconut oil is a 4, isopropyl myristate is a 5, and even something like wheat germ oil is a 5.
By comedogenic standards, silicones are among the safest ingredients you can put on acne-prone skin.
Why Silicones Get Blamed Unfairly
Despite the low ratings, silicones have developed a bad reputation. Here's why:
The "Clean Beauty" Movement
The rise of clean beauty in the 2010s and 2020s positioned silicones as "synthetic chemicals" to avoid. Many clean beauty brands made "silicone-free" a selling point, which implied silicones were harmful. This was a marketing narrative, not a scientific one. Being synthetic doesn't make an ingredient comedogenic.
Anecdotal Reports
People who switch to "silicone-free" products sometimes see their skin improve. They attribute the improvement to removing silicones — but the products they stopped using likely contained other comedogenic ingredients (oils, esters, fatty acids) that were the real culprits. When you switch products, you change dozens of ingredients at once.
The "Suffocation" Myth
A common claim is that silicones "suffocate" the skin by forming an impenetrable barrier. This isn't accurate. Dimethicone forms a semi-permeable barrier — it allows water vapor and gases to pass through while reducing transepidermal water loss. Studies have confirmed that dimethicone does not occlude the skin the way heavy waxes and petroleum-based occlusives can.
Misidentification
Many products that cause breakouts happen to contain silicones — but they also contain emollients, fatty acids, and oils that have much higher comedogenic ratings. Silicones are easy to spot on an ingredient list (they usually end in "-cone" or "-siloxane"), which makes them an easy target.
When Silicones CAN Be a Problem
Silicones aren't completely off the hook. There are scenarios where they can contribute to breakouts — just not in the way most people think.
Trapping Comedogenic Ingredients Underneath
Silicones form a barrier on the skin. If you apply a comedogenic product first (a moisturizer with coconut oil, for example) and then layer a silicone-based primer on top, the silicone barrier can trap the comedogenic ingredient against the skin for longer. The silicone itself isn't the problem — it's amplifying the problem underneath.
This is why product order and ingredient checking across your entire routine matters, not just one product at a time.
Buildup Without Proper Cleansing
Silicones are not water-soluble. If you don't cleanse thoroughly, silicone residue can accumulate on the skin over days. While this residue isn't comedogenic on its own, it can trap other substances (oil, dead skin cells, pollution) against the skin. A proper double cleanse (oil-based cleanser followed by a water-based cleanser) prevents this entirely.
Individual Sensitivity
A small percentage of people are genuinely sensitive to silicones — not because they're comedogenic, but because they cause irritation or contact dermatitis. If you've methodically eliminated all comedogenic ingredients and you're still breaking out in areas where you use silicone-heavy products, it's worth testing a silicone-free routine. But this is the exception, not the rule.
The Real Culprits to Look For Instead
If you're blaming silicones for your breakouts, check your products for these ingredients first — they have significantly higher comedogenic ratings and are far more likely to be the cause:
- Isopropyl myristate (rating 5) — Found in moisturizers, foundations, and lotions
- Coconut oil (rating 4) — Found in "natural" skincare and hair products
- Ethylhexyl palmitate / Octyl palmitate (rating 4) — Common in sunscreens and foundations
- Algae extract (rating 5) — Found in marine-themed skincare lines
- Acetylated lanolin (rating 4) — Found in rich creams and lip products
- Sodium lauryl sulfate (rating 5) — Found in foaming cleansers and shampoos
- Lauric acid (rating 4) — A coconut oil derivative found in many products
These are the ingredients that are actually clogging your pores. Silicones, at worst, might be making the situation slightly worse by trapping them in.
The fastest way to identify the real culprits in your routine is to scan your products' ingredient lists. high-rated comedogenic ingredients first (the list above). Eliminate those before touching silicones.
The Bottom Line
Silicones are one of the most misunderstood ingredient categories in skincare. The data is clear: dimethicone, cyclomethicone, and cyclopentasiloxane are non-comedogenic to very slightly comedogenic. They don't suffocate the skin. They don't clog pores at the rates people claim.
What they can do is trap other comedogenic ingredients underneath them — which is why checking your entire routine matters, not just one product. Focus on the ingredients with ratings of 3, 4, and 5 first. That's where the real breakout triggers are hiding.