Pore Score in Skin Analysis: Why Pores Look Bigger in Some Scans

A pore score in skin analysis rates how visible your pores are in a photo, usually by detecting the small dark openings on your cheeks, nose and forehead and measuring how many there are, how large they look and how much they contrast with the skin around them. Because it depends on what the camera resolves, distance, oil and lighting can move the number as much as your skin does.

This guide covers how apps find pores in a selfie, why the same face can produce a pore score that swings from one week to the next, and how to set up scans so the comparison is fair. For ways to make pores look smaller, see how to minimize pores; this page stays on reading the number.

How do apps measure pore size from a photo?

They look for small, roughly round spots that are darker than the surrounding skin and sit in a repeating pattern. A pore opening is a slight dip that holds shadow, and an oily or clogged pore can look darker still. After finding the face and masking out eyes, brows and lips, the software scans each zone for those spots and then summarizes them as a count, an average size, a total area, or a grade learned from expert-scored images.

Research tools do the same thing with more control. In a frequently cited study, investigators photographed pores with a dermoscopic video camera and measured them with an image analysis program. Consumer apps work from a much wider, less controlled selfie, so many rely on trained models. In a 2026 study that trained an AI on images graded by five dermatologists, cheek pore visibility was among the measures that correlated strongly with device readings, and pore grades correlated well with expert scores. Pores are one of the more measurable signs in a photo. The weak link is usually the photo itself.

What makes pores look bigger in some scans?

Pores look larger in a scan whenever something increases their contrast or the detail the camera can see. The pore itself rarely changes size overnight; its visibility does.

Camera distance and resolution

The closer the lens, the more pixels land on each pore. A pore that blends into skin tone at arm's length can become a clearly countable dot at half that distance. Front cameras also vary, so switching phones can shift your baseline. Pick one distance and one phone, and keep both the same. Our guide to taking a skin selfie for analysis has a repeatable setup.

Sebum

Oil is the factor with the strongest evidence behind it. In the dermoscopic study of 60 volunteers, higher sebum output was the factor most strongly linked to larger pore size, followed by male sex, with older age also associated. The link was stronger in men (r = 0.47) than in women (r = 0.38), and in women pore size was significantly larger during the ovulation phase of the cycle. A review in Dermatologic Surgery lists the three main causes of enlarged pores as excess sebum, reduced elasticity around the pore and enlarged hair follicles. The practical upshot for scanning: an oily afternoon will usually score worse than a freshly cleansed morning. If midday shine is the issue, our page on why your face gets oily by noon may help.

Season

A study of 100 Korean men measured skin in both summer and winter and found that summer showed more pores than winter, along with higher sebum. Only men were studied, so treat it as a hint about seasonal swings rather than a rule. Still, comparing a July scan with a January scan mixes a seasonal change into whatever your routine is doing.

Lighting

Pores are dips, and dips hold shadow. Light from the side or straight down from a ceiling fixture fills each opening with shade and makes pores look larger and more numerous. Soft, even light from the front reduces that shadow. See the best lighting for skin photos for setups that work at home.

Where on the face do pore scores differ most?

Pore scores often vary by zone, and the nose isn't always the worst. An imaging study of oily-skin traits in 19 women found that the cheek area had a larger number of large pores, while the nose had the highest sebum content in its follicle openings, and on the chin oil, roughness, pores and comedones rose together. An app that reports pores by zone can show which area is driving your overall number.

Not every dark dot on the nose is an enlarged pore. Sebaceous filaments are, in Cleveland Clinic's words, a normal, healthy element of your skin, usually gray, light brown or yellow, and they show up as small flat spots on the nose, forehead, chin and cheeks. An algorithm may count them as visible pores. Our guide to blackheads vs sebaceous filaments explains how to tell them apart.

Does age change your pore score?

Yes, gradually. The AAD explains that as we age, skin loses firmness and starts to sag, and that the more sun-damaged the skin, the less firmness it has, which can make pores look larger. The dermoscopic pore study also found older age associated with larger pores, though less strongly than sebum. These changes happen over years, so they won't explain a jump between last week's scan and this week's.

How do I compare pore scores fairly?

Hold every condition constant except your skin. A short checklist:

1. Same time of day. Morning, after a gentle cleanse, before moisturizer, sunscreen or makeup.
2. Same light. Face a window with indirect daylight. Skip overhead bathroom lights and the flash.
3. Same distance and angle. Arm's length, phone at eye level, head straight.
4. Same phone. A new phone means a new baseline.
5. Same cycle phase, if you menstruate. Pores can measure larger around ovulation.
6. Trends over snapshots. Compare the average of three or four scans with the average from four to eight weeks earlier.

Expect small moves between individual scans. A difference that persists across several weeks of consistent photos is far more likely to reflect real change than a single good or bad day.

Why doesn't my pore score match what I see in the mirror?

Your eyes and the camera judge pores differently. In a mirror you look from a moving distance, with your brain averaging the view. The camera freezes one angle at one distance and counts every dark dot it can resolve, including sebaceous filaments and fine shadows. If the score feels off, check the photo first: a close, side-lit, oily shot will almost always read worse than how you'd describe your skin.

Can skincare change a pore score?

It can change how visible pores look, which is what the score measures. Oil, clogging and firmness all affect how pores look, and the AAD notes that clogged pores expand, which makes them more noticeable. A review of 19 clinical trials found that treatments were assessed with digital imaging, physician assessment and patient satisfaction, and that combining approaches gave better results for pore size and number. For the routine side, including ingredients such as retinoids and salicylic acid, go to how to minimize pores. Give any change several weeks before reading much into the pore trend.

How can a selfie scan help you track pores?

The value of a scan is consistency over time. Pori takes a selfie, maps your face with a 468-point mesh and reads each region separately, then gives an overall skin score from 0 to 100 with a Pores & Texture category alongside Hydration & Moisture, Pigmentation & Tone, Anti-aging & Elasticity and Overall health. Before-and-after comparisons and progress charts make it easier to see whether a change in routine moved your pores over a month, and the skin diary lets you check whether oily weeks line up with stress, sleep or diet. Pori is free to download with a free first scan; Pro costs $9.99 a week with a 3-day trial for eligible Apple IDs, or $49.99 a year (US, as of October 2026).

A pore score describes appearance in a photo. It isn't a diagnosis, and it can't tell a blackhead from a skin growth that needs a look. See a dermatologist for any bump that bleeds, grows or changes.