October 01, 2026
In brief: The opening of a pore cannot be permanently made smaller, because its size is set by the hair follicle and sebaceous gland underneath. Pores can, however, look noticeably smaller when less sebum flows through them, when the plug inside is cleared, and when the skin around the opening stays firm and smooth. That is a realistic goal; a permanent "shrink" is not.
A facial pore is the opening of a pilosebaceous unit: a hair follicle, usually carrying a fine vellus hair, with a sebaceous gland emptying into it. It has no muscle around it, so it cannot open with steam or close with cold water. What you see as a "big pore" is the funnel-shaped top of that follicle, made more visible by oil and keratin sitting in it and by the shadow at its rim. A review of the causes named three main drivers: high sebum output, reduced elasticity around the pore, and a larger hair follicle, with recurrent acne, sex hormones and skincare habits adding to them (Lee 2016). Which of these dominates in your skin decides how much change is possible.
Sebum output is the strongest single predictor measured so far. In 60 volunteers, pore size rose with sebum output, age and male sex, and sebum output correlated with pore size more than any other factor (Roh 2006). The correlation was moderate (r = 0.47 in men, 0.38 in women), which means oil explains part of the picture, not all of it. Oil output is set largely by androgens and genetics, so it can be reduced somewhat but not switched off.
Sebum mixes with shed keratinocytes to form a soft plug. On the nose these are usually sebaceous filaments, a normal lining that refills within a few weeks after it is squeezed out. When the plug oxidizes at the surface it turns grey or black and makes the opening look larger. Clearing the plug is the most visible short-term change you can make, but it has to be repeated, because the gland keeps producing.
With age and sun exposure, collagen and elastic fibres around the follicle weaken and the pore rim sags into an oval or teardrop shape, most obviously on the cheeks (Lee 2016). This type of pore responds more to sun protection and collagen-supporting care than to oil control; when anti-ageing care is worth starting covers that side.
In the same study, women's pores measured larger during the ovulation phase of the menstrual cycle, and sebum explained less of pore size in women than in men, pointing to additional hormonal influences (Roh 2006). A pore that looks bigger one week and smaller the next is often behaving normally.
Acne severity itself was not linked to pore size in that study (Roh 2006), but repeated inflammation around the follicle can leave the opening wider and the surrounding skin scarred. Pitted acne scars are a separate problem from pores and need different treatment.
Avoid squeezing and pore strips on sensitive skin: they remove the filament for a few days and can leave broken capillaries, redness and dark marks. Skip daily scrubs, stacking acids with a retinoid, clay masks on already dry skin, and alcohol-heavy toners sold to "tighten" pores; the tightening feeling is dehydration, and an irritated barrier makes texture look worse. Heavy occlusive products can add to the plug in oily areas; what non-comedogenic really means explains why labels are only a guide.
See a physician or dermatologist if enlarged pores come with persistent inflamed acne, deep painful lesions or scarring, since treating the acne comes first and prescription options may be needed. Sudden oiliness with irregular periods, new facial or body hair, or scalp hair thinning can signal a hormonal condition that needs investigation. Oral anti-androgens and isotretinoin are prescription decisions for a physician. Energy-based treatments such as lasers belong with a qualified provider after an assessment.
Pore research is small. The main factor study enrolled 60 volunteers at a single centre in Seoul, and the niacinamide trials measured oil, not pores. Pores have no standard definition or measurement, so studies use different imaging methods and are hard to compare (Lee 2016). Most treatment evidence for pores comes from small device studies, often without long follow-up, and a review of treatments describes the problem as multifactorial and difficult to treat (Dong 2016). Nothing reviewed here shows a permanent reduction of the follicle opening itself. This article is educational and is not a diagnosis or a substitute for care from a physician or dermatologist.
Literature retrieved from PubMed.
Most people with visible pores already own a toner, a mask and two serums promising to fix them. Knowing whether your pores are driven mainly by oil, by plugs or by loosening skin is worth more than another product, because each needs a different, short routine. At the Skin Lab in South Surrey, Clara assesses what is driving your pores and writes a personalised plan with one active at a time. Book the complimentary 45-minute consultation before you buy the next bottle.
For more on oily, breakout-prone skin that also reacts easily, visit the Sensitive Acne-Prone Skin Resource Centre.
Written and reviewed by Clara Song, Ph.D.
Founder and in-house formulator, COMPLETE ELIXIR
Ph.D. in Data Science · Medical Aesthetician Diploma
Last reviewed: October 1, 2026
This article distinguishes ingredient evidence, formulation rationale, finished-product evidence and professional observation. It is educational and does not replace medical diagnosis or treatment.
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