Microneedling for Acne Scars: Evidence, Sessions and Risks

Microneedling is one of the better-tolerated options for indented acne scars, and the evidence, while mostly small trials, points to real but modest improvement, often over 3 to 5 sessions. Adding platelet-rich plasma (PRP) appears to boost results. It is considered safe across skin tones and has a short recovery. What the evidence does not support is doing it yourself with a home roller.

What is microneedling and how does it work?

Microneedling, also called collagen induction therapy, uses very fine needles to make tiny punctures in the skin. The US Food and Drug Administration (FDA) describes needles that are rolled across the skin, stamped into it, or arranged on the tip of a pen-shaped motorised device. The American Academy of Dermatology (AAD) explains that these controlled micro-injuries prompt the skin to make new collagen, which gradually fills in and smooths depressed scars.

It is used for indented (atrophic) scars. It is not a treatment for flat dark marks left by acne, which usually fade on their own (see acne scars vs dark spots), and the AAD lists having a keloid as a reason to avoid it.

What does the evidence show?

There are quite a few trials now, but most are small, single-centre and hard to blind. Here is what the larger reviews found:

• The 2016 Cochrane review on acne scars (24 trials, 789 people) found chemical peeling and skin needling performed similarly, but concluded no scar treatment had strong enough evidence to be called first-line. Overall certainty was very low to moderate.
• A 2022 meta-analysis of randomised trials (12 studies, 414 participants) found standard microneedling gave better objective scar improvement than the comparison treatments, with less post-inflammatory hyperpigmentation and no reported cases of secondary scarring or infection. Radiofrequency microneedling did not show a significant advantage.
• A 2024 review describes a 2014 randomised split-face trial of 20 people who had three sessions two weeks apart; treated sides showed lower scar scores at six months, with no adverse events reported.
• A 2025 literature review of 15 recent studies concluded microneedling alone and in combination is safe and effective, and that combining techniques tends to beat any single treatment.

The AAD states microneedling can fade acne scars by 50% to 70%. That is an encouraging figure from a trusted body, but the controlled trials behind it are small, so I’d treat it as a best-case range rather than a promise.

Worth knowing: microneedling is a scar treatment, not an acne treatment. The AAD’s 2024 acne guideline found the evidence insufficient to make recommendations for procedures including microneedling in managing acne itself.

Does adding PRP make microneedling work better?

Probably, though the studies are not great. PRP is made by drawing your blood and concentrating the platelet-rich portion, which is applied to or injected into freshly microneedled skin. The AAD notes studies showing PRP plus a treatment like microneedling can lead to less visible scarring.

The biggest analysis so far, a 2026 meta-analysis of 17 studies (9 randomised) with 1,111 participants, found that microneedling plus PRP roughly tripled the chance of an “excellent” result (at least two grades of improvement) compared with microneedling alone (risk ratio 3.05). Redness, swelling, pain and hyperpigmentation were similar between groups. The authors still called the included studies low quality overall, citing small, single-centre trials and inconsistent ways of preparing PRP. PRP also adds cost and a blood draw.

How many sessions, and how much downtime?

Needle depth varies with the scar and the area treated. A 2024 review cites a split-face study in which 2.5 mm needles improved acne scars more than 1.5 mm needles, which is one reason clinic devices differ so much from home rollers.

Is microneedling safe for darker skin?

This is one of its biggest selling points. The AAD describes microneedling as safe for all skin tones, including darker skin. The 2022 meta-analysis also found less post-inflammatory hyperpigmentation with microneedling than with comparison treatments. In an uncontrolled study of 45 people with skin types III to V, four monthly sessions of subcision plus microneedling improved scars by at least one grade in 95.6%, with redness, swelling and pain lasting 1 to 2 days.

Radiofrequency (RF) microneedling, which adds heat, is different. The AAD calls it safe for all skin tones, but in October 2025 the FDA issued a safety communication about reports of burns, scarring, fat loss, disfigurement and nerve damage, stressing that RF microneedling is a medical procedure that should not be done at home. If you’re offered RF microneedling, ask about the provider’s training with that specific device.

How does microneedling compare with lasers and peels?

Head-to-head evidence is limited, but the pattern is fairly consistent. In the Cochrane review, chemical peeling and skin needling produced similar participant-rated improvement, while peels were not tolerable for some participants. The 2022 meta-analysis found microneedling caused less post-inflammatory hyperpigmentation than the treatments it was compared with, which is why it is often suggested for darker skin. Fractional lasers can produce bigger changes in some scars but usually mean more downtime and more pigment risk; see laser treatment for acne scars. Many people end up with a combination, for example subcision for rolling scars, TCA CROSS for ice pick scars, and microneedling across the whole area.

What aftercare helps results?

The AAD’s aftercare advice for acne scar procedures is simple: follow your dermatologist’s product instructions because treated skin is sensitive, apply a broad-spectrum, water-resistant SPF 30 or higher sunscreen every day, limit time outdoors for 6 to 8 weeks, and keep treating your acne so new scars don’t form. It also notes that scar treatment is “rarely one and done.”

Who should avoid microneedling?

The AAD advises against microneedling if you heal slowly or poorly, have a keloid, have a weakened immune system, are being treated for skin cancer in the area, or are having radiation treatment. The FDA recommends telling your provider about all medicines, especially blood thinners, and checking that a new needle cartridge is used for each patient. Most dermatologists also want active acne under control first; the AAD notes scar treatment typically starts once breakouts are managed. If you’re pregnant, raise it at the consultation.

Why not use a derma roller at home?

Because home tools are either too weak to do what clinic microneedling does, or deep enough to cause harm without the safeguards. The key facts:

• The FDA says it “has not authorized any microneedling medical devices for over-the-counter sale.” Products with short, blunt needles that only claim to exfoliate aren’t regulated as medical devices at all.
• The AAD says at-home products aren’t meant to puncture the skin and give less noticeable results than treatment from a dermatologist. When done by untrained people, it warns, microneedling can cause infection, scarring or long-lasting discoloration, and home use risks overuse and spreading viruses.
• If you do own a home device, the FDA advises cleaning it between uses according to the manufacturer’s instructions and never sharing it.

For what you can safely do at home in the meantime, see how to fade acne marks, and for how microneedling compares with lasers, peels and subcision, see acne scar treatments.

Frequently asked questions