Closed Comedones: What Actually Works, According to the Evidence (Retinoids vs Salicylic Acid)

Closed comedones are those small, skin-colored bumps that sit just under the surface and refuse to come to a head. They form when a hair follicle clogs with dead skin cells and oil, then seals over with a thin layer of skin. The good news: they respond to treatment, but the evidence behind the popular fixes is not equal, and knowing which ingredient has real trial data behind it changes how fast you clear.

What Closed Comedones Actually Are

A comedone is a clogged pore. When the plug stays open to the air, the top oxidizes and turns dark, and you get a blackhead (an open comedone). When the pore seals over with a thin skin layer, the plug stays trapped and pale, and you get a closed comedone, often called a whitehead.

Both are forms of non-inflammatory acne. They are not red, not painful, and not filled with pus. That distinction matters because the treatments that work best on red, angry pimples are not always the same ones that clear stubborn closed comedones.

How they form

The starting point is something dermatologists call follicular hyperkeratinization. The cells lining the pore stop shedding cleanly. Instead of flaking away, they stick together and pile up. Mix in sebum (your skin's natural oil), and you get a soft plug. The microscopic version of this plug is the microcomedone, and every visible comedone starts there before you can see it.

Several things push this process along:

Excess oil production, often driven by hormones (puberty, menstrual cycle, certain birth control changes)
Heavy or pore-clogging cosmetics and skincare
Friction and occlusion (tight hats, phone screens, sweaty headbands)
Genetics, which strongly influence how reactive your pores are

Closed comedones love the forehead, chin, and cheeks, and they tend to cluster. You often feel them before you see them.

One detail worth understanding: closed comedones are a precursor stage. Left in place, that trapped plug can become inflamed if bacteria multiply inside the sealed follicle, and a quiet whitehead can turn into a red, tender papule. So treating them is not only about smoothing texture. It is also about stopping the next breakout before it starts. (Acne Vulgaris, StatPearls)

What they are not

People confuse closed comedones with two other things, and the mix-up leads to months of wasted product.

Fungal acne (technically Malassezia folliculitis) is an overgrowth of yeast in the follicle. It shows up as uniform, itchy, monomorphic bumps, often on the chest, back, and hairline. It does not respond to comedone treatments. It needs antifungal medication. If your bumps itch and look identical to each other, this is worth ruling out.

Sebaceous hyperplasia and milia are also commonly mistaken for closed comedones. Milia are tiny hard keratin cysts that usually need physical extraction, not a topical. When in doubt, a dermatologist can tell them apart in seconds.

The Two Front-Runners: Retinoids vs Salicylic Acid

Most of the internet debate comes down to two ingredients. Here is the honest version of how they stack up.

Topical retinoids

Retinoids are vitamin A derivatives. They include over-the-counter adapalene and retinol, plus prescription tretinoin, tazarotene, and trifarotene. They are the most studied class of acne treatment, full stop.

Mechanism. Retinoids bind to retinoic acid receptors inside the cells lining the pore. They normalize how those cells shed, breaking up the sticky plug at its source and preventing new microcomedones from forming. In plain terms, they fix the exact problem that creates a closed comedone. They are described as comedolytic (they break down existing comedones) and anti-comedogenic (they stop new ones).

Evidence grade: strong. The 2024 American Academy of Dermatology (AAD) acne guidelines give topical retinoids a strong recommendation, based on moderate-certainty evidence pooled from multiple randomized controlled trials. This is the highest tier of confidence the guideline assigns to any topical comedone treatment. (2024 AAD acne guidelines, PMID 38300170) Because retinoids attack comedone formation directly, they are the best-supported option specifically for closed comedones, not just acne in general. The AAD's own plain-language summary of the same guidelines confirms topical retinoids as a core first-line therapy for almost everyone with acne. (AAD updated acne management guidelines)

It helps to be specific about what "strong recommendation" means here. In guideline language, a strong recommendation paired with moderate certainty signals that the benefits clearly outweigh the downsides and that most patients should be offered the treatment. A pooled analysis of randomized trials found that people using a topical retinoid were more likely to show meaningful improvement at 12 weeks than people using a placebo vehicle. That is the kind of evidence that earns the top tier. (Topical retinoid acne trials, PubMed)

Salicylic acid

Salicylic acid is a beta-hydroxy acid (BHA). It shows up in cleansers, toners, pads, and spot treatments, usually at 0.5% to 2%.

Mechanism. Salicylic acid is oil-soluble, so it can travel into the sebum-filled pore. There it loosens and dissolves the keratin debris making up the plug. That gives it a real comedolytic effect, and the oil-soluble part is genuinely useful because closed comedones are oily by nature.

Evidence grade: weaker and mixed. Here is where the honesty matters. The same 2024 AAD guidelines give salicylic acid only a conditional recommendation, based on low-certainty evidence drawn from a small number of trials. (2024 AAD acne guidelines, PMID 38300170) It is not that salicylic acid does nothing. Randomized trials do show meaningful reductions in non-inflammatory lesions. (Salicylic acid comedonal acne trial, PMID 21896127) The problem is volume and quality of evidence. Retinoids have been tested in many large trials; salicylic acid has been tested in few. So the confidence behind it is simply lower.

To put numbers on it: in one randomized split-face study of people with comedonal acne, a salicylic acid peel reduced the number of non-inflammatory lesions by roughly 48% over about 14 weeks, while a closely related lipohydroxy acid peel reduced them by about 56% on the other side of the same faces. (Salicylic acid peel trial, PMID 21896127) Those are real, useful reductions. But notice the catch: that was a peel protocol, not a daily over-the-counter wash, and the study was small. The everyday salicylic acid products most people buy are milder and less studied. So when someone claims salicylic acid "clears closed comedones," the honest answer is that it helps, the effect is modest, and the strongest data come from in-office peel concentrations rather than the 2% pad you grab at the drugstore. (Salicylic acid acne evidence, PubMed)

Head-to-head

There is no large, high-quality trial that directly pits salicylic acid against a retinoid specifically for closed comedones and crowns a winner. Anyone who tells you the matchup is settled by data is overstating it. What we can say, from the body of evidence as a whole:

Factor	Topical retinoid	Salicylic acid
Drug class	Vitamin A derivative	Beta-hydroxy acid (BHA)
Main action	Normalizes pore-cell shedding at the source	Dissolves keratin plug inside the pore
Prevents new comedones	Yes, well documented	Limited evidence
AAD 2024 evidence grade	Strong rec, moderate certainty	Conditional rec, low certainty
Best OTC options	Adapalene 0.1%	0.5%-2% leave-on or wash
Time to visible results	8-12 weeks	3-6 weeks for surface texture
Main downside	Irritation, purging, slow start	Less long-term plug prevention
Verdict for closed comedones	First choice	Useful add-on or gentler starter

The practical takeaway: for closed comedones, a retinoid is the better-supported first choice because it prevents the plugs from forming in the first place. Salicylic acid works faster on surface texture and is a reasonable option if retinoids irritate your skin, but the evidence that it keeps comedones from coming back is thin.

A note on what the comparison does not tell you

Two ingredients can both "work" and still serve different jobs. Salicylic acid is a good housekeeper: it keeps the surface clear and the pores swept out. A retinoid is a remodeler: it changes how your skin behaves at the cellular level so fewer plugs form to begin with. That difference is why most dermatologists do not see them as rivals at all. They see salicylic acid as a helpful supporting player and a retinoid as the backbone of treatment. If you frame the question as "which one," you may be asking the wrong question. The better question is usually "which one is my foundation, and what do I add around it."

Adapalene: The OTC Sweet Spot

If you take one practical thing from this article, it is this: adapalene 0.1% gel is the most accessible evidence-backed retinoid for closed comedones, and you do not need a prescription for it.

In 2016, the FDA approved adapalene 0.1% gel (Differin) for over-the-counter sale, making it the first retinoid available without a prescription in the US and the first genuinely new OTC acne active since the 1980s. (FDA NDA 020380, Differin OTC approval)

Why adapalene specifically:

It is a true prescription-strength retinoid sold OTC, not a weaker cosmetic retinol
It is generally better tolerated than tretinoin, with less redness, peeling, and stinging in head-to-head studies, while delivering comparable comedone reduction
It is more stable in sunlight and when combined with benzoyl peroxide than tretinoin

A systematic review of topical acne treatments confirms retinoids, including adapalene, significantly reduce both open and closed comedones. (Cureus systematic review, PMID 38725769) For most people with closed comedones and no access to a dermatologist, adapalene 0.1% once nightly is the rational starting point. We compare the retinoid options in detail in our adapalene vs tretinoin guide and our ranking of OTC and prescription retinoids.

Other Evidence-Based Options

Retinoids and salicylic acid are not the only tools. A few others have solid or at least moderate support.

Benzoyl peroxide

Benzoyl peroxide is best known as an antibacterial that kills Cutibacterium acnes, so its strength is inflammatory acne rather than pure comedones. It does have a mild comedolytic effect. In a randomized trial, a salicylic acid derivative and 5% benzoyl peroxide both reduced non-inflammatory lesions, with no statistically significant difference between them. (LHA vs benzoyl peroxide trial, PMID 19250161) For closed comedones alone, benzoyl peroxide is not a first choice, but it pairs well with adapalene and is the standard partner for preventing antibiotic resistance.

Azelaic acid

Azelaic acid normalizes pore-cell shedding and has antibacterial activity. It works on both comedonal and inflammatory lesions and is unusually gentle, which makes it a good fit for sensitive skin, rosacea-prone skin, and pregnancy (always confirm with your clinician). It is a reasonable alternative when retinoids are off the table. The systematic review of topical acne treatments groups azelaic acid among the effective options for non-inflammatory lesions, though its effect size sits below that of the retinoids. (Cureus systematic review, PMID 38725769) (Azelaic acid acne evidence, PubMed)

Chemical exfoliants and peels

In-office or at-home salicylic acid and glycolic acid peels can speed up clearance of surface plugs. Trial data show salicylic acid peels reduce non-inflammatory lesions meaningfully over several weeks. (Salicylic acid peel trial, PMID 21896127) These help, but they treat what is already there more than they prevent new comedones, so they work best alongside a retinoid rather than instead of one.

How the alternatives compare

Here is a quick reference for the non-retinoid options, scored for closed comedones specifically.

Option	Main mechanism	Strength for closed comedones	Evidence quality	Best fit
Adapalene (retinoid)	Normalizes pore-cell turnover	High	Strong (AAD strong rec)	First choice for most
Salicylic acid	Dissolves keratin in the pore	Moderate	Low to moderate	Sensitive skin, faster surface results
Benzoyl peroxide	Kills acne bacteria, mild comedolytic	Low to moderate	Strong for inflammatory acne	Mixed comedonal + inflamed acne
Azelaic acid	Normalizes shedding, antibacterial	Moderate	Moderate	Sensitive, rosacea-prone, pregnancy (confirm)
Glycolic/lactic acid (AHA)	Surface exfoliation	Low to moderate	Limited for comedones	Dullness plus mild texture
Salicylic or glycolic peel	Stronger in-office exfoliation	Moderate	Moderate (small trials)	Add-on to speed clearance

The pattern is clear. Only the retinoid earns a "high" rating with strong evidence. Everything else lands in the moderate-to-low range, which is exactly why the guideline panels rank retinoids first.

What to skip

Pore strips pull out surface debris but do nothing for the deep, sealed plug of a closed comedone
DIY extraction at home is the fastest route to scarring and infection; leave deep extractions to a professional
Heavy "blackhead" scrubs can irritate and worsen the picture without touching the underlying cause

For a broader look at how the acid families compare, see our breakdown of salicylic acid vs benzoyl peroxide vs azelaic acid.

How to Build a Routine That Works

Layering matters as much as ingredient choice. A simple, consistent routine beats a complicated one you abandon after two weeks of irritation.

A sensible starting plan

Cleanse with a gentle, non-foaming cleanser, morning and night
Treat at night with adapalene 0.1%, a pea-sized amount for the whole face
Moisturize with a non-comedogenic moisturizer over the retinoid (the "moisturizer sandwich" reduces irritation)
Protect in the morning with broad-spectrum SPF 30 or higher, because retinoids increase sun sensitivity

If a nightly retinoid is too much at first, start two or three nights a week and build up. Salicylic acid can be added as a cleanser or used on the nights you skip the retinoid, but using strong actives at the same time often just irritates.

A few small habits make the difference between a routine that clears skin and one that wrecks the barrier:

Less is more. A true pea-sized amount of adapalene covers the whole face. More product does not work faster; it just irritates.
Wait on damp-skin application. Applying a retinoid to fully dry skin (wait 10-20 minutes after washing) reduces stinging for many people.
Buffer if needed. Putting moisturizer on first, then the retinoid, then more moisturizer is a legitimate way to ease in. It slows absorption slightly but keeps you consistent, and consistency wins.
Do not pile on acids during the adjustment phase. If you start a retinoid, pause the strong AHA/BHA products for the first few weeks so you are only managing one source of irritation.

If you are wondering about how long to pause between steps or whether layering order matters, the short answer is that simple beats elaborate. A clean three-product routine you actually follow outperforms a ten-step regimen you quit.

Set realistic timelines

This is where most people quit too early. Retinoids work slowly because they are remodeling how your pores behave. Expect:

Weeks 2-6: possible worsening, called purging, as deep plugs surface
Weeks 6-8: texture starts to even out
Weeks 12+: meaningful clearing of closed comedones

That early flare is real and expected with retinoids. If you cannot tell whether it is purging or a genuine bad reaction, our guide on skin purging vs breakout walks through the difference.

Stop feeding the problem

No active will win if your other products are clogging your pores. Closed comedones are strongly linked to comedogenic cosmetics and oils. Switch to products labeled non-comedogenic, and be skeptical of heavy facial oils marketed as cure-alls; some are common offenders, as we cover in is coconut oil comedogenic.

Safety, Side Effects, and Who Should Be Careful

Common side effects

Retinoids cause dryness, redness, flaking, and stinging, especially in the first month. These usually settle as your skin adjusts. The fixes are well established: use less product, apply less often, and moisturize more. Salicylic acid can also dry and irritate at higher concentrations or with overuse.

Sun sensitivity

Both retinoids and exfoliating acids make skin more vulnerable to UV. Daily sunscreen is not optional with these ingredients. It protects results and prevents the dark marks that closed comedones can leave behind.

Who should check with a clinician first

Pregnant or breastfeeding: topical retinoids are generally avoided in pregnancy; azelaic acid is often considered a safer alternative, but confirm with your own clinician
Very sensitive or barrier-compromised skin: start low and slow, or choose a gentler active. Our best retinoids for sensitive skin guide covers tolerable options
No improvement after 12 weeks of consistent use: see a dermatologist. Persistent closed comedones sometimes need prescription-strength retinoids, professional extraction, or a second look to rule out fungal acne or another condition

A dermatologist can also prescribe stronger retinoids (tretinoin, tazarotene, trifarotene) or combination products when OTC options stall. Prescription tretinoin comes in higher strengths than anything sold over the counter, and tazarotene is among the most potent comedolytics available. For comedones that simply will not budge, a clinician may also perform manual comedone extraction with sterile tools, which clears the existing plug while your topical prevents new ones. The combination of a prescribed retinoid plus periodic professional extraction is a common path for stubborn, recurring closed comedones.

Why "natural" fixes often disappoint

A quick word on the home remedies that flood social media. Toothpaste, lemon juice, baking soda, and aggressive scrubbing all share a problem: they irritate the skin without addressing follicular hyperkeratinization, the actual cause. Some lower the skin's pH or strip the barrier, which can make comedones worse over the following weeks. There is no credible trial evidence that any kitchen remedy clears closed comedones, and several can cause chemical burns or post-inflammatory marks. The boring answer, a gentle routine built around a retinoid, beats them every time.

Who This Is For

Adapalene or another retinoid is the evidence-led first move if you have:

Clusters of small, skin-colored or pale bumps with no redness or pain
A long-running texture problem that scrubs and toners have not fixed
Patience for a 12-week timeline and a willingness to use sunscreen daily

Salicylic acid is the better starting point if your skin reacts badly to retinoids, you want faster surface smoothing, or you are pairing it with a retinoid for extra exfoliation. And if your bumps itch, look identical, and cluster on the chest or hairline, pause and rule out fungal acne before spending another dollar on comedone products.

Frequently Asked Questions

Do closed comedones go away on their own?

Some resolve over weeks, but many persist for months because the trapped plug has no easy exit. Left alone and fed by comedogenic products, they tend to stick around or multiply. A comedolytic ingredient like a retinoid or salicylic acid speeds clearance and, more importantly, prevents new ones from forming.

Is salicylic acid or a retinoid better for closed comedones?

For the long game, a retinoid has stronger evidence because it stops comedones from forming at the source, which is why the 2024 AAD guidelines give retinoids a strong recommendation and salicylic acid only a conditional one. Salicylic acid works faster on surface texture and is gentler to start with, so many people use it first or alongside a retinoid. Neither has been crowned in a large head-to-head trial.

How long does adapalene take to clear closed comedones?

Plan on 8 to 12 weeks of nightly use before judging results. The first few weeks can look worse as deep plugs surface, which is purging, not failure. Consistency matters more than strength; using it every night for three months beats stopping and starting.

Can I use salicylic acid and a retinoid together?

You can, but layering two strong actives in one session often just causes irritation without extra benefit. A common approach is a salicylic acid cleanser in the morning and a retinoid at night, or alternating nights. Start slow, watch for dryness, and back off if your skin gets raw.

Why do my closed comedones keep coming back?

Usually because the underlying cause is still active: comedogenic products, hormones, or stopping treatment too soon. Retinoids prevent recurrence, but only if you keep using them as maintenance; the plugs return when you quit. Recurring bumps that itch and look identical may not be comedones at all, but fungal acne, which needs antifungal treatment instead.

This article is for general education and is not medical advice. Acne and related skin conditions vary by person; consult a board-certified dermatologist before starting or changing a treatment, especially if you are pregnant, breastfeeding, or have a chronic skin condition.