Acne Scars: Types, What Actually Works & Matching Treatment to Scar
Acne scarring is frustrating precisely because different types of marks respond to completely different treatments — and the wrong treatment for the wrong scar type either does nothing or makes things worse. The first and most important step is identifying which type of mark you're dealing with.
What Causes Acne Scars?
Acne scars develop when inflammation damages the skin beneath the surface.
As the skin heals, the body produces collagen to repair the damaged area. If too much collagen is produced, a raised scar may form. If too little collagen is produced, a depressed scar may develop.
The risk of scarring is often higher when:
Acne is severe
Spots are squeezed or picked
Breakouts remain untreated for long periods
There is a genetic tendency to scar
Not everyone who develops acne will experience permanent scarring, but the risk increases with more severe inflammation.
The essential distinction: PIH vs true acne scars
This distinction is the most important and most often missed. Most people use "acne scar" to describe any mark left after a spot clears, but PIH and true scars are fundamentally different and respond to different approaches.
Post-inflammatory hyperpigmentation (PIH) — flat, dark marks (red, brown, or purple depending on skin tone) left after an acne lesion heals. PIH is not structural damage; it is a melanocyte response to inflammation. Melanocytes in the affected area produce excess melanin, depositing it in the dermis. PIH fades naturally over months to years as the skin turns over and the pigment is gradually shed. It responds to topical treatments that inhibit melanin production or accelerate skin turnover.
True acne scars — involve structural changes to the dermis. They result from inflammation-driven loss or excess of dermal collagen during the healing process. True scars don't fade naturally — the collagen deficit or excess is permanent without targeted intervention. They do not respond to topical skincare in the way PIH does; they require treatments that stimulate new collagen formation or physically remodel the dermis.
If you're looking in the mirror at flat dark marks with no texture change — you have PIH, which will fade. If you have texture changes, pits, depressions, or raised areas — those are true scars.
The types of true acne scars
Atrophic scars — caused by collagen deficit during healing. The body produces insufficient collagen to replace what inflammation destroyed. Three subtypes:
Ice pick scars — narrow, deep, sharply defined tracks extending into the dermis. Often described as looking like punctures. Most common on the cheeks. The most difficult to treat because of their depth.
Boxcar scars — wider, round or oval depressions with well-defined vertical walls. Shallower than ice pick scars. Appear on cheeks and temples. More amenable to treatment than ice pick.
Rolling scars — broad, undulating depressions caused by fibrous bands tethering the dermis to deeper tissues. Create a wave-like uneven texture across wider areas.
Hypertrophic and keloid scars — caused by excess collagen production during healing. Raised above the skin surface. More common on the chest, back, and jawline. Hypertrophic scars stay within the original wound boundary; keloid scars extend beyond it. More common in people with darker skin tones.
The Best Professional Treatments For Acne Scars
Microneedling
Microneedling creates tiny controlled injuries in the skin to stimulate collagen production.
It may help improve:
Rolling scars
Mild boxcar scars
Overall skin texture
Chemical Peels
Chemical peels remove damaged surface layers of skin.
They are often used to improve:
Skin tone
Pigmentation
Mild textural irregularities
Laser Resurfacing
Laser treatments are among the most commonly recommended options for acne scarring.
They work by encouraging new collagen production and skin remodelling.
Laser therapy is often considered for:
Moderate scarring
Widespread scarring
Long-standing scars
Dermal Fillers
Fillers may be used for certain depressed scars.
The filler lifts the scar from beneath, creating a smoother appearance.
Results are often temporary and may require repeat treatment.
Subcision
Subcision is a procedure that breaks up the fibrous bands pulling rolling scars downward.
It is frequently combined with other treatments.
Matching treatment to scar type
This is the core practical value of the article — the wrong treatment for the wrong scar achieves nothing.
For PIH (flat dark marks):
Topical treatments are appropriate and effective. Azelaic acid — tyrosinase inhibitor, reduces melanin production. Vitamin C serums — same mechanism, additional antioxidant protection. Lactic acid and glycolic acid — accelerate pigmented cell shedding through exfoliation. Niacinamide — inhibits melanosome transfer from melanocytes to keratinocytes. Retinoids — accelerate skin turnover, promoting faster shedding of pigmented layers. Daily SPF — essential; UV exposure deepens PIH and slows fading.
PIH from acne typically fades within 3–12 months with consistent treatment. Darker skin tones take longer due to greater melanocyte reactivity.
For ice pick scars:
Punch excision — the most appropriate specific treatment. The ice pick scar channel is excised with a small biopsy punch and sutured or grafted. Transforms an ice pick scar into a superficial linear scar that heals with far less visible texture. Chemical reconstruction of skin scars (CROSS) — high-concentration trichloroacetic acid (TCA) applied precisely to the base of ice pick scars stimulates localised collagen formation. Multiple sessions required. Both are clinic-based procedures.
Microneedling and fractional laser have limited effectiveness for ice pick scars because they don't reach the depth of the scar channel.
For boxcar scars:
Microneedling — stimulates collagen production that gradually fills the boxcar depression. Multiple sessions (typically 3–6) with intervals of four to six weeks between. Most effective for shallow to moderate boxcar scars. Fractional laser resurfacing — ablates scar tissue and stimulates collagen remodelling; more effective for moderate boxcar scars than microneedling but with longer recovery. Subcision combined with filler — for deeper boxcar scars, subcision releases the scar base and filler provides immediate volume correction. Results last 12–24 months.
For rolling scars:
Subcision — the most targeted treatment. A small needle is inserted beneath the skin and swept to sever the fibrous bands tethering the rolling scar. This releases the depression and allows it to rise. Often combined with microneedling or filler for best results. The microdermabrasion article in this series notes that surface-only exfoliation doesn't reach the fibrous bands causing rolling scars.
For hypertrophic and keloid scars:
Intralesional corticosteroid injections — reduce scar volume and flatten raised scars over a series of treatments. The standard first-line approach. Silicone sheets or gels — apply pressure and occlude the scar, reducing collagen overproduction. Used for months. Laser (pulsed dye laser) — reduces redness and some volume in hypertrophic scars. Keloid scars often recur after any treatment; specialist dermatology assessment is needed.
What topical skincare can and cannot do for true scars
This is the most important expectation-setting point. Topical products including retinoids, vitamin C, AHAs, and niacinamide improve the surface appearance of skin and are highly effective for PIH — but they cannot remodel structural dermal collagen deficit or excess. They may improve the overall skin quality around scars and reduce the contrast of scar appearance, but they will not lift, fill, or physically remodel atrophic or hypertrophic true scars. Anyone who has used topical treatments consistently for several months without improvement in textural scars needs professional assessment, not a new topical product.
Recommended Products
Paula's Choice 10% Azelaic Acid Booster
a 10% azelaic acid serum appropriate for fading post-acne PIH on acne-prone skin. Azelaic acid's dual action — tyrosinase inhibition reducing melanin production alongside anti-inflammatory properties — makes it specifically appropriate for PIH that is still occurring alongside active acne, unlike pure exfoliating acids that require completely settled skin. Fragrance-free and well-tolerated on sensitive and reactive skin.
Kelo-Cote Silicone Scar Gel
a medical-grade silicone gel for hypertrophic and keloid scars. Applied twice daily to established raised scars, silicone creates an occlusive microenvironment that reduces excessive collagen production and gradually flattens the scar over months of consistent use. Kelo-Cote is one of the most clinically referenced silicone scar preparations available without prescription in the UK.
What About Natural Remedies?
Many people explore natural options such as:
Aloe vera
Rosehip oil
Tea tree oil
Apple cider vinegar
Coconut oil
While some individuals report positive experiences, evidence supporting these approaches for significant acne scarring remains limited.
Natural remedies should generally be viewed as supportive rather than transformative.
The prevention priority
Every true acne scar that doesn't form is a scar that doesn't need treating. The measures that prevent scarring are covered throughout the acne series:
Treating acne early and effectively — the more inflammatory and cystic the acne, the higher the collagen-damaging inflammation.
Not picking or squeezing — mechanical trauma deepens inflammation into the dermis where collagen lives.
Daily SPF throughout acne treatment — UV exposure worsens PIH and can impair healing during active acne phases.
Why Sunscreen Matters
Sun exposure can make acne marks appear darker and more noticeable.
Daily sunscreen use may help:
Prevent pigmentation from worsening
Support skin healing
Protect treatment results
Broad-spectrum SPF is often recommended as part of any acne scar management plan.
Supplement Support For Skin Health
Active acne is the primary cause of all acne scarring. The nutritional foundations that reduce acne severity — zinc (antibacterial, 5-alpha-reductase), vitamin D (immune regulation), omega-3 (anti-inflammatory) — are the upstream prevention for scarring.
Drought's Skin Support Formula provides zinc, vitamin D, vitamin C, and 11 other nutrients — addressing the acne itself from within, which is the most effective scar prevention approach. Made in the UK, suitable for vegetarians, designed for consistent long-term daily use.
FAQ
What is the most effective acne scar treatment?
It depends on the scar type. Ice pick: punch excision or CROSS. Boxcar: microneedling or fractional laser. Rolling: subcision. Hypertrophic/keloid: intralesional steroids. No single treatment is best for all types.
Can acne scars be removed completely?
Some scars can be significantly improved, but complete removal is not always possible.
Does microneedling work for acne scars?
Best for boxcar and rolling scars. Limited effectiveness for ice pick scars (insufficient depth penetration). Not appropriate for active inflamed acne.
Can retinol help acne scars?
Retinoids may help improve skin texture and support skin renewal, particularly for mild scarring and pigmentation.
How long does it take to improve acne scars?
PIH: 3–12 months with consistent treatment. Atrophic scars with microneedling: typically 3–6 sessions over 6–12 months before full assessment. Results are gradual.
How do I know if I have PIH or a true acne scar?
PIH is flat with no texture change — just discolouration. True scars have textural changes: pits, depressions, or raised areas. PIH fades; true scars don't without treatment.
Can topical products remove acne scars?
Effective for PIH (azelaic acid, vitamin C, retinoids, niacinamide). Not effective for structurally remodelling atrophic or hypertrophic true scars — professional treatment is needed.
Final Thoughts
The fundamental distinction is PIH (flat dark marks, no texture change, fades with topical treatment and SPF) versus true acne scars (structural dermal change, requires collagen-stimulating or remodelling treatments). Matching treatment to scar type is essential: ice pick scars need punch excision or CROSS; boxcar scars respond to microneedling and fractional laser; rolling scars need subcision; hypertrophic/keloid scars need intralesional steroids and silicone. Topical skincare treats PIH effectively but cannot structurally remodel true scars. Prevention through early effective acne treatment and not picking remains the highest-impact intervention.
In Short
Acne scars form when inflammation damages the skin's deeper layers.
Different scar types respond to different treatments.
Preventing acne is one of the best ways to reduce future scarring.
Professional treatments are often more effective for deeper scars.
Results can take time and multiple treatments may be required.
Scar treatment addresses what inflammation has already done. Zinc, vitamin D, and vitamin C address the acne driving that inflammation — the upstream prevention that reduces both scarring incidence and PIH formation. Drought's Skin Support Formula provides all three alongside 11 other nutrients, made in the UK and designed for consistent long-term use.
Start your skin support journey →
Written by the Drought Skin team — specialists in natural support for psoriasis, eczema and acne
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