Microneedling

Also known as: collagen induction therapy, dermarolling, dermapen

Microneedling uses a roller or motorized pen studded with fine needles to punch hundreds of controlled micro-injuries into the skin, prompting a wound-healing response that builds new collagen. It is one of the better-studied minimally invasive procedures: a 2022 meta-analysis of 12 randomized trials supports it for atrophic acne scars, where it performs about as well as chemical peels but below fractional lasers. Evidence for wrinkles and melasma is thinner and mostly comes from small trials or studies where microneedling is paired with topical drugs.

How it works

Needles 0.5 to 2.5 mm long breach the epidermis and upper dermis, triggering platelet activation, growth factor release, and fibroblast recruitment. Over weeks the skin lays down new collagen and elastin in the treated zones. The channels also temporarily increase absorption of topicals applied during treatment, which is why it is often combined with tranexamic acid, vitamin C, or PRP.

What the evidence says, claim by claim

These are the results measured in studies, not the results shown in ads. Where the research is weak, the grade says so.

For acne scars

Moderate evidence

A 2022 meta-analysis of 12 randomized controlled trials (414 participants) found microneedling monotherapy produced a statistically significant improvement in atrophic acne scars, though the pooled effect was modest. A 2024 network meta-analysis of RCTs found combining microneedling with peels or other agents outperforms either alone, and rated microneedling the most tolerable option for pain. Most protocols in these trials used 3 to 6 sessions spaced about 4 weeks apart.

Randomized trials support this use, but they are few, small, or short. The effect is probably real. The size of it is less certain.

Microneedling Monotherapy for Acne Scar: Systematic Review and Meta-Analysis of Randomized Controlled Trials (Aesthetic Plastic Surgery, 2022; meta-analysis)
Comparing the efficacy and safety of microneedling and its combination with other treatments in patients with acne scars: a network meta-analysis of randomized controlled trials (Archives of Dermatological Research, 2024; meta-analysis)

For wrinkles and fine lines

Limited evidence

Anti-aging evidence is far weaker than the acne scar data. A randomized trial of 20 women aged 35 to 60 who got 4 monthly sessions found measurable texture improvement, with larger gains when growth factor serums were added, but trials this small cannot support the sweeping rejuvenation claims made in marketing. No large RCT has compared microneedling against established wrinkle treatments like retinoids or resurfacing lasers.

Only small, short, or lower-quality studies exist. Treat marketing claims about this use with caution.

An Assessment of Microneedling with Topical Growth Factors for Facial Skin Rejuvenation: A Randomized Controlled Trial (Journal of Clinical and Aesthetic Dermatology, 2020; RCT)

For melasma

Limited evidence

A 2020 systematic review of 8 studies concluded that microneedling may help melasma, but rated the evidence low quality, and most positive results came from microneedling used as a delivery vehicle for drugs like tranexamic acid rather than on its own. A 2025 meta-analysis of randomized trials of microneedle-assisted therapy found benefits starting around week 4 with best results near week 24, again mostly in combination protocols. Melasma also recurs readily, so any gains need maintenance and strict sun protection.

Only small, short, or lower-quality studies exist. Treat marketing claims about this use with caution.

A Systematic Review of the Efficacy and Safety of Microneedling in the Treatment of Melasma (Dermatologic Surgery, 2020; systematic-review)
Efficacy of Microneedle as an Assisted Therapy for Melasma: A Meta-analysis and Systematic Review of Randomized Controlled Trials (Aesthetic Plastic Surgery, 2025; meta-analysis)

Risks and what can go wrong

Downtime is 1 to 3 days of redness and pinpoint bleeding, sometimes mild swelling and flaking. It is generally considered one of the safer options for darker skin (Fitzpatrick IV to VI) because it does not rely on heat or light, though post-inflammatory hyperpigmentation can still occur if done aggressively. Avoid with active acne flares, active infection (including cold sores in the area), keloid tendency, or recent isotretinoin use depending on your dermatologist's judgment. At-home rollers with reused or dull needles carry infection and scarring risk.

The practical details

Typical course is 3 to 6 in-office sessions spaced 4 weeks apart, roughly 200 to 700 dollars per session in the US depending on market and add-ons. At-home rollers (0.25 mm) do not reach the dermis and should not be expected to reproduce clinical results.