Microneedling: What Does the Evidence Actually Show?

Microneedling is now offered almost everywhere: medical clinics, beauty salons, home skincare devices and, increasingly, as part of elaborate combinations involving serums, platelet-rich plasma, growth factors or other products.

Its list of claimed benefits has expanded just as quickly.  Acne scars, enlarged pores, fine lines, pigmentation, skin laxity, stretch marks, rosacea and general “skin renewal” are all routinely mentioned.

Before deciding to introduce SkinPen Precision Elite™ at Cosmenon, I spent time reviewing the published literature.  I wanted to understand where microneedling performs well, where the evidence remains preliminary, and which familiar claims have moved further than the research supporting them.

My reading left me with a favourable view of mechanical microneedling, particularly for selected acne scars and milder changes in skin texture.  It also reinforced the importance of matching the treatment to the condition in front of us.  A device can have a credible biological mechanism and still be poorly suited to a particular scar, pigment disorder or inflammatory skin condition.

The treatment has a plausible biological basis.

Mechanical microneedling passes very fine sterile needles through the epidermis, creating closely spaced columns of controlled injury.  The surrounding skin remains largely intact, allowing the treated area to recover without the broad surface removal associated with ablative resurfacing. 

These microinjuries activate an organised wound-healing response.  Platelets release signalling molecules, inflammatory cells enter the area, fibroblasts become active and extracellular-matrix remodelling follows.  Collagen deposition and reorganisation develop over time rather than during the procedure itself. 

Laboratory evidence of increased collagen does not tell us exactly how much improvement a patient will see.  Treatment depth, needle density, technique, scar architecture, age, inflammation and individual healing characteristics all influence the clinical result.  Histological change is biologically interesting, but patients are usually more interested in whether a scar looks shallower, whether the surface appears smoother and whether that improvement is worthwhile.

Claims that microneedling “rebuilds” or “restores” the skin tend to compress a complicated biological process into a marketing phrase.

The evidence changes according to what we’re treating.

Cosmetic treatments are often assessed with a single broad question: does it work?

That question needs an indication attached to it.

A treatment can perform well for one type of tissue problem and offer only modest benefit for another.  Microneedling provides a good example because its evidence is strongest in acne scarring, reasonably encouraging for fine texture and early wrinkling, and much less settled across several of its commonly advertised uses.

The published acne-scar literature includes randomised trials, comparative studies, systematic reviews and meta-analyses.  Facial rejuvenation research is smaller.  Studies of pigmentation frequently combine needling with topical medications, which makes the contribution of the needling itself difficult to isolate.

This variation is important when discussing expected outcomes.  “Clinically studied” can describe anything from a large controlled trial to a small open-label series with short follow-up and subjective photography.

Acne scarring is where microneedling has the strongest support

Atrophic acne scars form when inflammation damages the dermis and the healing process leaves a depression in the skin.  Microneedling is well suited to selected scars because controlled dermal injury can encourage remodelling along and around the scar margins.

In a randomised, “split-face” clinical trial published in JAMA Dermatology participants received three needling treatments on one side of the face while the other side acted as a control (can you imagine only getting treatment on only one side of your face?!).  Blinded scar scores improved on the treated side at six months, and participants reported a mean improvement of 41% in overall scar appearance. The trial was small (15 participants completed it) but its controlled design provides useful evidence that the observed change was greater than natural fluctuation or photography alone.

Larger reviews have reached broadly similar conclusions.  A systematic review of nine randomised trials found microneedling effective and generally well tolerated for atrophic acne scars, both alone and in combination with other treatments.  The authors also highlighted the small samples and limited duration of follow-up across much of the literature.

A 2022 meta-analysis included 12 randomised studies and 414 participants.  Mechanical microneedling produced objective scar improvement and compared favourably with several alternative treatments.  The findings were encouraging, although the included studies differed in devices, protocols, comparators and outcome measures.

More recent network analyses continue to support microneedling as a useful treatment, while also suggesting that combinations or other modalities may rank more highly for particular outcomes.  That fits clinical experience: microneedling has a genuine role in acne-scar treatment, without being the best procedure for every scar.

Acne scars are not one anatomical problem

A patient may describe a collection of depressions as “acne scarring,” but the individual scars can have very different structures.

Rolling scars have broad, sloping edges and may be pulled down by fibrous attachments beneath the skin.  Shallow boxcar scars have more defined edges but remain relatively accessible to surface remodelling.  Ice-pick scars are narrow and extend deeply into the dermis.

Microneedling tends to make more sense for rolling scars that are not heavily tethered and for shallower boxcar scars.  A deep ice-pick scar is unlikely to disappear because needles have been passed repeatedly over the surface.  Its geometry may be better addressed with a focal technique such as TCA CROSS or, in selected cases, a punch procedure.

Subcision addresses another part of the problem.  By releasing fibrous bands beneath a tethered rolling scar, it treats a mechanical attachment that microneedling alone may leave intact.  Laser resurfacing, focal chemical reconstruction, fillers and minor surgical techniques can also have roles within a broader scar plan. 

This is why I would hesitate to offer every patient with acne scars the same three-session package.  The number of sessions matters, but the initial scar diagnosis matters more.

How much improvement should someone expect?

The most realistic description is gradual softening rather than scar removal.

Studies commonly use three or more treatments separated by several weeks.  Improvement may continue for months as collagen remodels, so early photography does not necessarily show the final result.  A patient’s response cannot be predicted precisely from the number of sessions alone. 

Even the 41% patient-reported improvement in the Alam trial should be interpreted in context.  It was an average from a small study, not a result that can be promised to every patient.

Scar depth, scar type, current acne activity, treatment intensity and healing response all affect the outcome.  Severe scarring often benefits from a sequence of different procedures rather than escalating one technique indefinitely.

The evidence for facial rejuvenation is promising, although less mature.

Microneedling is often promoted for fine lines, texture, pores and visible skin ageing.  There are published studies supporting improvement in these areas, but the evidence does not yet have the same consistency as the acne-scar literature.

A single-centre study of 35 participants examined four monthly treatments to the face and neck.  Thirty-two completed the study.  Investigators reported changes in epidermal and dermal measurements, alongside improvement in fine lines and wrinkles.  The study included objective imaging and small skin biopsies, which strengthens its biological observations, although it did not include an untreated control group.

A 2025 systematic review examined 21 facial-rejuvenation studies involving 723 patients.  Wrinkles were the most common outcome, followed by skin texture and photoageing.  Reported patient satisfaction was high, but treatment schedules varied and most participants underwent multiple sessions.  The review also found marked differences in study design and outcome measurement.

Several rejuvenation trials combine microneedling with growth factors, conditioned media or other topical preparations.  These studies may show improvement, but they do not always tell us what mechanical microneedling would achieve by itself.  A randomised study involving topical growth factors, for example, found changes in both the microneedling-only and combination groups, with additional improvements in some measures where the growth-factor preparation was used.

From a clinical perspective, this supports offering mechanical microneedling for relatively mild textural ageing and fine surface wrinkling, provided the language remains measured.  It does not support describing the procedure as a facelift, a replacement for lost volume or a reliable correction for substantial skin laxity.

More collagen does not automatically create a lifted face

Collagen is central to dermal strength, but facial ageing involves much more than dermal collagen alone.

Bone remodels.  Fat compartments change in volume and position.  Retaining structures alter.  Repeated facial movement continues, while cumulative ultraviolet exposure affects collagen, elastin, pigmentation and vascularity.

Microneedling operates predominantly within the skin.  It cannot restore skeletal support, replace depleted facial volume or reposition descended tissues.  Fine wrinkling and surface quality may improve while jowls, deep folds or structural hollowing remain largely unchanged.

Confusing these problems leads to disappointing treatment plans.  A skin procedure should be judged by what it can reasonably change within the skin.

What about enlarged pores?

Pores cannot be permanently opened and closed.  They are visible openings associated with pilosebaceous units, and their appearance is influenced by oil production, hair follicles, skin texture, dermal support and lighting.

Microneedling may soften their appearance by improving the surrounding surface and dermal architecture.  Evidence for predictable pore reduction remains limited, and many studies rely on photography, patient grading or combination treatments.

“May improve the appearance of enlarged pores” is a reasonable description. 

Pigmentation requires a separate conversation

Microneedling is increasingly discussed as a treatment for melasma and other pigmentary conditions.  Much of the favourable evidence relates to microneedling used alongside topical therapies, including tranexamic acid, Vitamin C and hydroquinone-based regimens.

A systematic review and meta-analysis of 12 studies involving 459 patients found that adding microneedling to topical treatment improved melasma severity more than topical therapy alone.  The study described microneedling as an adjunct rather than establishing it as a consistently effective stand-alone procedure.

There is also a practical safety consideration.  The controlled inflammation produced by needling can provoke post-inflammatory hyperpigmentation, particularly when treatment is aggressive or the skin is already inflamed, recently tanned or inadequately protected from ultraviolet exposure.  Mechanical microneedling avoids the thermal injury associated with lasers and radiofrequency devices, but it does not remove pigment risk. 

For that reason, I do not regard “pigmentation” as a single indication.  Melasma, lentigines, post-inflammatory pigmentation and an undiagnosed pigmented lesion require different clinical decisions.

Active acne should be controlled before treating the scars

Microneedling treats the consequences of acne.  It does not control the disease process producing new lesions.

Passing a device through inflamed pustules, nodules, cysts or infected skin can increase inflammation and potentially spread organisms across the treatment field.  Ongoing acne also means that new scars may continue to form while existing ones are being treated.

A scar program makes more sense once inflammatory acne is stable.  Patients with nodulocystic disease, continuing scar formation or diagnostic uncertainty may need medical acne treatment or dermatology referral before any resurfacing procedure begins. 

Rosacea and reactive skin need caution

Microneedling creates predictable erythema and inflammation.  That response may be acceptable in healthy, stable skin, but it may be poorly tolerated during a rosacea flare, active dermatitis or significant barrier disruption.

I would not present microneedling as routine rosacea treatment.  A patient with stable rosacea might still be considered for a separate indication, such as acne scarring, once the inflammatory condition is controlled.  The treatment settings and aftercare would need to reflect the increased reactivity of the skin. 

Mechanical and radiofrequency microneedling should not be confused.

The word microneedling now covers two distinct categories.

SkinPen Precision Elite™ is a mechanical device.  It creates injury through needle movement and does not deliver radiofrequency energy or heat.

Radiofrequency microneedling inserts needles and then delivers thermal energy into the tissue.  The additional heat changes the biological effect, treatment indications, equipment risks and potential complications.

Research involving radiofrequency microneedling cannot automatically be used to support claims about a mechanical device.  The same applies in reverse. 

I chose a mechanical system because it offers a controlled, non-thermal treatment for selected scars and textural concerns, but that doesn’t make it universally safer or more effective than an energy-based device.

I think this is a relatively safe procedure.

Temporary redness, warmth, tenderness, mild swelling, dryness and fine scaling are expected after treatment.  Pinpoint bleeding may occur when greater depth is used.

A systematic review of adverse effects found that most reported reactions were mild and transient.  The review also documented less common complications, including infection, post-inflammatory pigmentation, allergic reactions, tram-track scarring and granulomatous responses.

A separate systematic safety review similarly concluded that microneedling generally has a favourable safety profile, while noting the need for better standardisation and longer-term reporting.

Published safety data are reassuring, though they should not lead to complacency.  The procedure deliberately breaches the epidermis.  Sterile single-use cartridges, appropriate skin preparation, handpiece protection, sharps disposal and careful management of anything placed on treated skin are essential parts of treatment. 

The products applied during treatment deserve more scrutiny

One of the most significant changes in microneedling practice has been the addition of products intended to pass through the temporary channels created in the skin.

A product designed for application to an intact epidermis has not necessarily been tested for introduction beneath it.  Preservatives, fragrances, proteins, particulate material and non-sterile formulations may behave very differently once the barrier has been breached.

Granulomatous and hypersensitivity reactions have been reported after inappropriate topical products were used with needling.

Adding platelet-rich plasma, polynucleotides, exosomes, growth factors or compounded preparations creates a separate clinical question.  Each product has its own evidence, sterility requirements, regulatory position and risk profile.  The popularity of a combination on social media does not answer those questions.

How does microneedling compare with laser devices?

Comparative studies suggest that both mechanical microneedling and fractional laser can improve acne scarring.  The relative result depends on scar type, laser technology, treatment settings, skin phototype and the outcome being measured.

A systematic review comparing needling approaches with ablative fractional lasers found improvement with both categories and no consistent overall superiority across the included studies.  The underlying evidence was heterogeneous, and several studies combined mechanical and radiofrequency needling within the same review.

Ablative laser may offer greater change for selected deeper scars or established photodamage, alongside more recovery and a different risk of prolonged erythema, infection and dyspigmentation.  Mechanical microneedling often appeals to patients seeking a non-thermal option with a more manageable recovery period.

The appropriate comparison is not simply which device is stronger.  It is which treatment addresses the particular scar or skin problem with an acceptable balance of improvement, risk and downtime.

Where microneedling fits at Cosmenon

After reviewing the evidence, I am happy to offer SkinPen Precision Elite™ to patients whose concerns are well suited to mechanical microneedling.

Its strongest role is in selected atrophic acne scars, uneven skin texture and fine surface wrinkling. For these concerns, a properly planned treatment course can produce worthwhile, gradual improvement without the use of thermal energy.

At Cosmenon, treatment begins with identifying what is actually contributing to the skin concern. Rolling scars, shallow boxcar scars and textural irregularity may respond well. Deeper tethered scars, ice-pick scars, active inflammatory acne or significant structural ageing may need a different or combined approach.

For suitable patients, SkinPen™ offers a credible, evidence-supported option with relatively manageable recovery. Treatment is performed using sterile single-use cartridges, conservative settings and a plan based on the condition of the skin rather than a standard package.

Microneedling is not expected to correct every feature of facial ageing, but it can be a valuable treatment for improving selected scars and skin quality. Patients considering it are welcome to book a consultation at Cosmenon to determine whether SkinPen Precision Elite™ is likely to be appropriate and what degree of improvement would be realistic.

All references used in the writing of this article are available for review in the Article Index.