PDRN Injection for Acne Scars: How It Works, Results & What to Expect

Why Injectable PDRN for Acne Scars?

Acne scars are one of the most frustrating skin concerns to treat. The scarring represents permanent structural damage in the dermis — destroyed collagen, absent elastin, and often poor blood supply in the scar bed. Surface-level treatments can improve texture, but truly remodeling the damaged tissue requires reaching the dermis where the damage lives.

This is exactly why PDRN injection has become one of the most sought-after treatments for acne scarring in Korean and European clinics. Unlike topical serums that face the stratum corneum barrier, injectable polydeoxyribonucleotide delivers regenerative DNA fragments directly into the scarred dermis — right where the damage is ^[1][2].

How PDRN Injection Remodels Acne Scars

PDRN injected into acne scar tissue activates multiple regenerative pathways simultaneously ^[1][3]:

1. Fibroblast Reactivation

Acne scar tissue contains dormant, metabolically inactive fibroblasts that have essentially stopped producing collagen. PDRN binds to the adenosine A2A receptor on these fibroblasts, reactivating them to resume producing type I and type III collagen — the structural proteins that the scar tissue lacks ^[1][3].

2. Angiogenesis

One of the major reasons acne scars resist treatment is poor vascularity. Scar tissue has fewer blood vessels than normal skin, meaning less nutrient delivery and slower metabolic activity. PDRN promotes angiogenesis — the formation of new blood vessels — within the scar bed ^[4]. This revascularization is critical: it creates the blood supply needed to sustain ongoing tissue repair.

3. Collagen Remodeling

PDRN does not simply add collagen to scar tissue — it stimulates organized, functional collagen production that gradually replaces the disorganized scar matrix ^[3]. Over a series of treatments, the scar tissue is progressively remodeled to more closely resemble normal dermis. This is tissue regeneration, not just tissue filling.

4. Anti-Inflammatory Repair

Many acne scars have a persistent low-grade inflammatory component, especially scars that developed from nodular or cystic acne. PDRN's anti-inflammatory action through A2A receptor-mediated NF-κB suppression helps calm this residual inflammation while repair proceeds ^[1].

5. Nucleotide Supply

The DNA fragments in PDRN enter scar tissue cells through the nucleotide salvage pathway, providing building blocks for DNA synthesis in proliferating fibroblasts and endothelial cells ^[1][5]. This is particularly important in avascular scar tissue where nutrient supply is already limited.

Which Acne Scars Respond Best?

Not all acne scars are the same, and PDRN injection has different efficacy depending on scar type:

Scar Type	Description	PDRN Response
Rolling scars	Broad, shallow depressions with sloping edges	Excellent — fibroblast activation fills from below
Boxcar scars	Rectangular depressions with defined edges	Good — dermal thickening improves depth
Ice pick scars	Deep, narrow pits	Moderate — often needs combination treatment
Hypertrophic scars	Raised, thickened scars	Good — anti-inflammatory action helps remodel
Post-inflammatory erythema	Red/pink flat marks	Excellent — vascular normalization and anti-inflammation

Rolling scars and boxcar scars respond best because they have sufficient surface area for PDRN to stimulate broad tissue regeneration. Ice pick scars are the most challenging due to their narrow, deep structure — they often benefit from subcision or TCA CROSS before PDRN treatment to release the scar base.

The Procedure: What Happens During Treatment

Pre-Treatment

Your dermatologist will assess your scar types, severity, and skin condition. Photographs are taken for documentation. If you are using tretinoin or retinol, you should pause 3-7 days before treatment.

During the Session

1. Cleansing — The face is thoroughly cleansed and antiseptic is applied
2. Anesthesia — Topical numbing cream is applied for 20-30 minutes
3. Injection — PDRN is injected using a fine needle (30-32G) directly into and around each scar

• For individual scars: 0.02-0.05 mL placed directly under the scar base
• For diffuse scarring: Grid-pattern micro-injections across the entire affected area
• Depth: 1-2 mm into the mid-dermis

1. Post-care — Gentle pressure applied, soothing serum applied

The procedure takes 20-40 minutes depending on the treatment area.

Products Used

The most commonly used injectable PDRN products for acne scars include:

• Rejuran S — Specifically formulated for scar treatment with higher viscosity for targeted delivery
• Rejuran Healer — Standard PDRN skin booster used for broader facial rejuvenation alongside scar treatment
• Nucleofill — European PDRN injectable
• Plinest — Another clinical-grade PDRN injectable

Treatment Protocol

A typical PDRN injection protocol for acne scars ^[2]:

Phase	Sessions	Frequency	Purpose
Intensive	4-6 sessions	Every 2-3 weeks	Build regenerative momentum
Consolidation	2-3 sessions	Every 4 weeks	Maximize collagen remodeling
Maintenance	Ongoing	Every 2-3 months	Sustain improvements

What to Expect After Each Session

• 0-24 hours: Redness, small bumps at injection sites, mild swelling
• 1-3 days: Bumps resolve, redness fades
• 1-2 weeks: Skin feels smoother and more hydrated
• 4-8 weeks: Collagen remodeling begins to improve scar depth
• 3-6 months: Maximum scar improvement visible after a full treatment course

Results are cumulative — each session builds on the previous one.

PDRN Injection vs. Other Scar Treatments

PDRN Injection vs. Fractional Laser

Fractional laser creates controlled thermal injury to stimulate a wound healing response. PDRN injection provides direct biological stimulation without tissue destruction.

• Laser: More downtime (3-7 days), higher risk of PIH in darker skin tones, one mechanism (wound healing response)
• PDRN: Minimal downtime (1-2 days), safe for all skin tones, multiple mechanisms (receptor activation + nucleotide supply + anti-inflammatory)
• Best approach: Combine them — PDRN injected 1-2 weeks after laser treatment accelerates healing and enhances collagen quality ^[1][4]

PDRN Injection vs. Microneedling

Microneedling creates micro-channels that stimulate collagen production. PDRN microneedling combines both — microneedling for the mechanical stimulus plus topical PDRN flooding through the channels.

• PDRN injection: Delivers higher concentration directly to dermal target cells
• PDRN microneedling: Covers a larger area, adds mechanical collagen stimulation
• Best approach: Alternate between injection sessions (for targeted deep scars) and microneedling sessions (for overall texture improvement)

PDRN Injection vs. Dermal Fillers

Hyaluronic acid fillers physically fill depressed scars for immediate improvement. PDRN stimulates the tissue to regenerate itself.

• Fillers: Instant but temporary (6-18 months), volume-dependent
• PDRN: Gradual but lasting (collagen remodeling is permanent), regeneration-based
• Best approach: Use fillers for deep individual scars that need immediate improvement, PDRN for overall scar quality and long-term remodeling

Combining PDRN Injection with Other Treatments

The most effective acne scar protocols combine PDRN injection with complementary treatments:

1. Subcision + PDRN — Release tethered scar bases, then inject PDRN to fill the space with new collagen
2. Fractional laser + PDRN — Laser first, PDRN 1-2 weeks later to enhance healing quality
3. PDRN microneedling between injection sessions — Broader surface treatment
4. Topical PDRN serum daily — Maintains regenerative support between professional sessions
5. Tretinoin + PDRN serum at home — Ongoing collagen stimulation between treatments

Cost Considerations

PDRN injection for acne scars typically costs $200-500 per session depending on the product used, the size of the treatment area, and your location. A full treatment course (4-6 sessions) represents a $800-3000 investment. While not inexpensive, the cost compares favorably to equivalent courses of fractional laser ($1000-4000+) and produces more reliable results for moderate acne scarring.

Who Is a Good Candidate?

PDRN injection for acne scars works best for ^[2][3]:

• Adults with moderate acne scarring (rolling, boxcar, or mixed types)
• Patients who want minimal downtime compared to laser
• Darker skin tones (Fitzpatrick IV-VI) where laser carries higher PIH risk
• People who have tried topical treatments and want professional-grade improvement
• Patients seeking long-term tissue remodeling rather than temporary filling

PDRN injection may not be sufficient as a standalone treatment for severe, deep ice pick scarring — these cases benefit from combination approaches.

Frequently Asked Questions

How many sessions of PDRN injection do I need for acne scars?

Most patients see meaningful improvement after 4-6 sessions spaced 2-3 weeks apart ^[2]. Severe scarring may benefit from 6-8 sessions. Results continue to improve for 2-3 months after the last session as collagen remodeling progresses.

Is PDRN injection painful?

With topical anesthesia (applied 20-30 minutes before treatment), most patients describe the sensation as mild pressure or pinching. The 30-32G needles used are extremely fine. The procedure is significantly more comfortable than laser treatments.

Can PDRN injection make acne scars worse?

No. PDRN does not cause tissue destruction or create additional scarring. The worst outcome is that the treatment has minimal effect on very deep or severely tethered scars. The risk-benefit profile is excellent.

Is PDRN injection safe for dark skin?

Yes. Unlike laser treatments, PDRN injection does not create thermal injury and therefore carries no risk of post-inflammatory hyperpigmentation ^[6]. It is safe for all Fitzpatrick skin types (I-VI), making it one of the best acne scar treatment options for darker skin tones.

How long do results last?

The collagen remodeling stimulated by PDRN is permanent — once new collagen is produced and organized, it remains ^[2][3]. However, normal aging continues, so maintenance sessions every 2-3 months help sustain optimal skin quality. Many patients continue with daily topical PDRN serum for ongoing support.