Closed Comedones: What They Are and How to Get Rid of Them

Closed comedones — also called whiteheads, though this term is used inconsistently — are one of the most frustrating skin concerns precisely because they respond poorly to most standard acne treatments. They look like small, flesh-coloured or slightly white bumps beneath the skin surface, without the dark oxidised head of a blackhead and without the redness of an inflammatory pimple. Understanding their structure explains why most treatments fail and why the small set that do work, work.

What Is a Closed Comedone?

A comedone forms when a hair follicle becomes blocked with a mixture of sebum and keratin — the protein shed from the follicle lining as part of normal skin cell turnover. In an open comedone (blackhead), the pore opening is exposed to air, the sebum mixture oxidises and darkens, and the contents can sometimes be expressed manually. In a closed comedone, a thin layer of skin seals the pore opening, preventing oxidation (hence the lack of dark colour), preventing natural drainage, and making manual expression traumatic to the surrounding skin.

The underlying cause is follicular hyperkeratinisation — the abnormal overproduction of keratin cells within the follicle lining, which accumulate faster than they can be shed and combine with sebum to form an impacted plug. This is a cellular process driven by a combination of genetics, androgens (hormones), and external triggers including certain skincare ingredients.

The Most Common Cause: Comedogenic Ingredients

The fastest-acting intervention for closed comedones is identifying and eliminating comedogenic ingredients from your routine. Comedogenic ingredients are those that tend to block follicles in susceptible skin. Common culprits include:

• Algae extracts and spirulina: High comedogenicity ratings; appear in "natural" skincare products.
• Coconut oil: One of the highest comedogenicity-rated common oils — frequently triggers closed comedones on the face even in non-acne-prone skin.
• Isopropyl myristate and isopropyl palmitate: Emollients common in foundations, sunscreens, and moisturisers with a high tendency to clog follicles.
• Wheat germ oil: High oleic acid content, well-documented comedogenicity.
• Lanolin and lanolin derivatives: Common in rich creams; moderately comedogenic in susceptible individuals.
• D&C Red dyes: Found in lipsticks and some foundations; comedogenic.

If closed comedones appear primarily in areas where a specific product is applied — around the jawline where a foundation is applied, on the forehead where a moisturiser is applied more heavily — the product is a strong suspect. Eliminating one suspect product at a time over four to six weeks is the most reliable way to identify the culprit.

Ingredients That Clear Closed Comedones

Retinoids (retinol, retinaldehyde, tretinoin): The most effective treatment for closed comedones, addressing the root cause — follicular hyperkeratinisation — directly. Retinoids normalise the rate at which keratin cells are produced and shed within the follicle, preventing the plug from forming in the first place, and accelerating the clearance of existing blockages. Results are slow — four to twelve weeks for visible improvement, with a potential purging phase as existing microcomedones are surfaced — but retinoids are the only topical ingredient with evidence for structural resolution of the comedone-forming process rather than just management of existing plugs.

Salicylic acid (BHA, 0.5–2%): Lipid-soluble BHA penetrates into the follicle and dissolves the sebum-keratin mixture. Unlike AHAs, which work at the surface, BHA reaches into the pore itself. Regular use (two to three times per week) prevents new closed comedones forming and gradually clears existing ones by loosening the plug over time. BHA is more of a maintenance and prevention tool than a rapid clearance treatment for established closed comedones, but it is consistently the most useful non-prescription adjunct to retinoids for this concern.

AHAs (lactic or glycolic acid): AHAs improve surface cell turnover, which reduces the dead cell accumulation that contributes to follicular blockage. They are less targeted than BHA for closed comedones specifically — their primary site of action is the surface rather than inside the follicle — but as part of a broader exfoliation routine they help prevent the surface hyperkeratinisation that feeds into comedone formation.

Niacinamide (5%): Reduces sebum production, which decreases the lipid substrate available for comedone formation. Not a comedone treatment per se, but an effective sebum-control measure that reduces the rate of new closed comedone formation in oily skin types.

What Does Not Work for Closed Comedones

• Benzoyl peroxide: Highly effective for inflammatory acne (papules, pustules) through its antibacterial mechanism. Closed comedones are not primarily a bacterial condition — the plug is formed before bacteria play a significant role. BP will not clear existing closed comedones and does not address the hyperkeratinisation that causes them.
• Pore strips: Designed to remove open comedones from the nose. Cannot dislodge closed comedones which are sealed beneath skin.
• Squeezing: Closed comedones are covered by intact skin. Manual pressure without piercing typically spreads the contents into surrounding tissue rather than expressing it, causing inflammation and potentially turning a comedone into an inflamed papule. Professional extraction by a dermatologist or aesthetician using proper technique is a different matter — but DIY squeezing of closed comedones reliably makes them worse.

The Routine for Clearing Closed Comedones

1. Audit your products for comedogenic ingredients. Check every product applied to the affected area — cleanser, moisturiser, SPF, foundation, primer — against a comedogenicity reference. Eliminate any high-risk products.
2. Introduce a retinoid. Start low (0.025–0.05% retinol) two nights per week and build up slowly. Expect initial purging as microcomedones are surfaced before clearance. This is the cornerstone treatment.
3. Add BHA on alternate nights. Salicylic acid 1–2% applied two to three times per week on non-retinol nights provides follicle-penetrating exfoliation alongside the retinoid.
4. Use a non-comedogenic moisturiser and SPF. Check labels specifically for the ingredients above. Gel-textured or oil-free formulas are lower risk.

Visible clearance with this approach typically takes six to twelve weeks. Individual stubborn comedones that persist can be extracted professionally — a dermatologist or trained aesthetician can pierce the skin cleanly with a sterile needle and extract the plug with minimal trauma.