What Causes Enlarged Pores? (And What Actually Helps)
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Quick answer: Pore size is set mainly by three things: how much oil the follicle produces, how firm the skin around each pore is, and the follicle's own genetically determined width. You can make pores look smaller by managing oil and supporting firmness, but you cannot physically shrink the opening.
Enlarged pores are one of the most searched-for skin concerns in the UK, and also one of the most misunderstood. The word "enlarged" suggests something has gone wrong, that a pore has stretched open and needs closing again. In reality, a pore is simply the visible opening of a hair follicle, and what you notice in the mirror is the result of a few ordinary biological factors combining. Some you can influence. One you largely cannot.
Understanding which is which matters, because it decides whether a product is worth your money. A treatment that keeps oil in check and keeps the skin around the pore firm will genuinely make pores less obvious. A "pore-shrinking" gimmick that promises to close pores for good is selling you a result that skin does not deliver. Below we walk through the three honest drivers of pore appearance, then what actually helps.
What actually causes enlarged pores?
Three factors do most of the work: oil (sebum) output, the elasticity and structure of the skin surrounding each pore, and the intrinsic size of the follicle itself. Age, sun exposure and genetics feed into all three. When people say their pores "got bigger", usually one or more of these shifted.
It helps to picture a pore as a small well. If the well fills with oil and dead cells, the opening looks wider and darker. If the ground around the well slumps and loses support, the rim looks larger and more open. And some wells are simply built wider than others from the start. Address the first two and pores retreat; the third sets a floor on how much change is realistic.
How does oil output make pores look bigger?
More sebum means a fuller, more visible pore. The follicle contains a sebaceous gland, and the more oil that gland produces, the more the channel is filled and stretched from within. This is why pores tend to look largest across the nose, forehead and inner cheeks, where oil glands are densest.
Sebum production is driven partly by hormones (particularly androgens), which is why pore visibility often increases during the teens, around the menstrual cycle, and in people with naturally oily or combination skin. When oil mixes with dead skin cells and sits in the opening, it oxidises and darkens, creating the blackhead-like speckling that makes pores read as larger than they are. Clear that debris and reduce the oil sitting in the channel, and the same pore looks noticeably tighter, even though its true diameter has not changed.
This is the driver you have the most control over. Ingredients that regulate oil and keep the follicle clear are the most reliable way to make oily-skin pores less prominent. Salicylic acid is the standout here: it is oil-soluble, so it can travel into the sebum-filled pore and dissolve the mix of oil and dead cells, rather than working only on the surface. Niacinamide is the other workhorse, valued for helping to moderate the look of oiliness over time.
Why does losing firmness make pores more visible?
When the skin around a pore loses its support structure, the opening slackens and looks wider. Each pore sits within a mesh of collagen and elastin. That mesh acts like scaffolding, holding the opening taut and round. As the scaffolding weakens, the rim of the pore is no longer held firmly, so it relaxes outward and can take on a slightly teardrop or oval shape rather than a neat circle.
The main things that weaken that scaffolding are age and cumulative sun exposure. Collagen production slows gradually from our mid-twenties, and UV exposure accelerates the breakdown of both collagen and elastin. This is why pores on sun-exposed, mature skin often look more open than they did a decade earlier, and why the same person may notice their most stretched-looking pores on the cheeks rather than only in the oily T-zone. It is also the strongest argument for daily sunscreen as a genuine pore treatment, not just an anti-ageing one: protecting the surrounding collagen keeps pores framed and firm.
On the active side, retinoids are the best-evidenced ingredients for supporting skin firmness and refining the look of pores over months of consistent use. They encourage cell turnover and help maintain the collagen framework that keeps the pore rim tight. This is slow, cumulative work rather than an overnight fix, which is exactly why it lasts.
Can you change the follicle's actual size?
Not meaningfully, and this is the honest limit of skincare. The baseline width of your follicles is largely genetic, set by the same inherited factors that determine skin type. If your parents have visibly porous skin across the nose and cheeks, you are more likely to as well, regardless of routine.
This is worth saying plainly because a great deal of marketing implies pores can be permanently closed or shrunk to nothing. They cannot. Pores have no muscle, so they do not open and close on command, and a cold splash of water or an astringent toner only causes a brief, temporary tightening of the surrounding skin, not a lasting change. What a good routine does is optimise everything around that genetic baseline: it empties the pore, keeps oil in balance, and keeps the surrounding skin firm, so the pore sits as small and as smooth as it is capable of looking. Managing expectations here is not defeatist. It is what separates a routine that quietly works from a cupboard full of disappointing "pore-perfecting" purchases.
What actually helps enlarged pores?
Consistency with a small number of proven actives beats any single miracle product. Because two of the three drivers are within your control, a straightforward routine can make a real, visible difference. The pillars are: a regular chemical exfoliant to keep the follicle clear, oil management, firmness support, and daily sun protection.
In practice that looks like a salicylic acid product a few times a week to decongest oily pores, niacinamide to support a smoother, less shiny surface, a retinoid introduced slowly for long-term firmness, and broad-spectrum SPF every morning to protect the collagen that frames each pore. Gentle, regular exfoliation removes the dead-cell build-up that makes pores look speckled and enlarged. What you want to avoid is over-scrubbing or stacking harsh actives, which irritates the skin, can prompt more oil, and undermines the very firmness you are trying to protect. Slow and steady genuinely wins here.
Frequently Asked Questions
Can enlarged pores be permanently closed?
No. Pores are follicle openings with no muscle, so they cannot be permanently closed by a product, and their baseline size is largely genetic. What you can do is make them look considerably smaller by keeping them clear of oil and debris and by supporting the firmness of the surrounding skin. That improvement is real but maintained by ongoing care, not permanent on its own.
Does drinking water shrink pores?
Not directly. Staying hydrated supports overall skin health, but pore size is governed by oil output, skin firmness and follicle structure, none of which changes meaningfully from water intake alone. Topical care that manages sebum and protects collagen has a far more visible effect on how open your pores appear.
Do pores get bigger with age?
They often look bigger with age, though the follicle itself has not truly grown. As collagen and elastin decline over the years and sun damage accumulates, the skin around each pore loses support and the opening slackens. Daily sunscreen and firmness-supporting actives such as retinoids are the most useful ways to slow this shift.
Is salicylic acid or niacinamide better for pores?
They do different jobs and work well together. Salicylic acid is oil-soluble, so it clears the oil and dead cells sitting inside the pore, which is ideal for oily, congested skin. Niacinamide helps support a smoother, less shiny surface over time. Using both, rather than choosing one, tends to give the most rounded result.
Why do my pores look bigger on my nose?
The nose has one of the highest concentrations of oil glands on the face, so the follicles there fill with sebum more readily and read as larger and darker. This is also the most common site for blackheads. An oil-soluble exfoliant used regularly on the area is the most effective way to keep those pores looking clearer.
Shop for enlarged pores
Because oil and congestion drive so much of how pores look, an oil-soluble exfoliant is the sensible starting point: browse our salicylic acid range to clear the follicle from within. Pair it with niacinamide to support a smoother, less shiny surface, and consider a retinol product to help maintain firmness around the pore over the longer term. Regular, gentle exfoliation keeps dead-cell build-up from making pores look speckled, and if shine is a daily frustration our wider oily skin edit brings the right actives together.
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Written by
Kate
Kate is an aesthetic therapist and skincare specialist who turns clinical ingredient science into simple, practical routines, with a focus on anti-ageing and skin-barrier health.