Mechanism of Action: The Science of Skin Remodeling
At its core, Rejuran works by leveraging the body’s own natural healing and regenerative processes to remodel scarred skin tissue. The primary active ingredient is Polynucleotide (PN), which are long-chain molecules derived from purified salmon DNA. These PN fragments are highly biocompatible, meaning the human body recognizes them as a familiar building block rather than a foreign substance. When injected into the dermal layer of skin damaged by acne, the PN molecules act as a powerful signal to the surrounding cells. They attract fibroblasts, which are the cells responsible for producing collagen, elastin, and hyaluronic acid—the essential components of youthful, healthy skin. This process doesn’t just add temporary volume like some fillers; it fundamentally encourages your skin to repair itself from the inside out.
The mechanism can be broken down into a precise sequence of biological events. First, the PN solution creates a hydrating matrix in the dermis, immediately improving skin moisture levels. Second, it reduces inflammation, a key lingering factor in persistent red or brown post-acne marks. Third, and most importantly, it stimulates neocollagenesis—the creation of new, well-organized collagen fibers. Acne scars, particularly atrophic ones like rolling or boxcar scars, are characterized by a loss and disorganization of collagen. By promoting the synthesis of new, structurally sound collagen, Rejuran gradually fills in these depressions and strengthens the skin’s foundation. Clinical studies have shown a significant increase in dermal density over a treatment course. It’s a regenerative treatment, not just a corrective one.
Targeting Different Types of Acne Scars
Not all acne scars are created equal, and Rejuran’s effectiveness can vary depending on the scar type. Its regenerative approach is particularly well-suited for specific classifications.
- Atrophic Scars (Depressed Scars): This is where Rejuran shines brightest. It is highly effective for rolling scars, which have sloping edges and give the skin a wavy appearance, and mild to moderate boxcar scars, which are wider depressions with sharper edges. The collagen-building action steadily elevates the depressed tissue. For very deep icepick scars, Rejuran may be used as an adjunct therapy to treatments like TCA cross but is less effective as a standalone solution.
- Post-Inflammatory Erythema (PIE – Red Marks) & Hyperpigmentation (PIH – Brown Marks): Rejuran’s anti-inflammatory properties and its ability to improve overall skin health and microcirculation can help accelerate the fading of these discolored marks left behind after a pimple heals.
- Hypertrophic & Keloid Scars: These raised scars are less common on the face from acne. Rejuran is not typically the first-line treatment for these, as the focus needs to be on reducing excessive collagen production, not stimulating it.
The following table provides a clearer overview of its suitability:
| Scar Type | Visual Description | Rejuran’s Effectiveness | Typical Notes |
|---|---|---|---|
| Rolling Scars | Broad, shallow depressions with sloping edges. | High | Considered a primary indication. Excellent for improving skin texture and elasticity. |
| Boxcar Scars | Wider, U-shaped depressions with sharper edges. | Moderate to High | Effective for shallower scars. Deeper ones may require combination therapy. |
| Icepick Scars | Deep, narrow, V-shaped pits that extend into the dermis. | Low to Moderate | Not a primary treatment. Can improve overall skin quality around the scars. |
| PIE / PIH | Flat red or brown discolorations. | Moderate | Works by calming inflammation and promoting healthy skin turnover. |
The Treatment Protocol: What to Expect During and After
Understanding the procedure helps set realistic expectations. A typical Rejuran treatment session for acne scars is a meticulous process performed by a qualified medical professional. First, a topical anesthetic cream is applied to the treatment area (usually the full face or specific zones like cheeks) for about 30-45 minutes to minimize discomfort. After cleansing, the practitioner will use a very fine needle or a specialized microcannula to perform multiple intradermal injections, depositing the PN solution evenly across the scarred areas and the surrounding skin. The pattern often resembles a grid, ensuring comprehensive coverage. The entire procedure usually takes between 30 to 60 minutes.
Immediately after the treatment, you can expect some common but temporary side effects. These include redness, slight swelling, and small raised bumps or wheals at the injection sites, which typically subside within a few hours to a day. Bruising is also possible. Unlike more aggressive laser treatments, there is little to no downtime. You can resume most normal activities immediately, though you must avoid strenuous exercise, excessive heat (saunas, hot yoga), and direct sun exposure for at least 24-48 hours. Makeup can usually be applied the next day once the tiny injection points have closed.
The results are not instant. This is a crucial point. Since Rejuran works by stimulating your body’s collagen production, the improvements appear gradually over weeks to months. A standard treatment protocol involves an initial series of 3 sessions, spaced approximately 4 weeks apart. Many practitioners recommend a booster session 6-12 months after the initial series to maintain and enhance the results. Clinical data suggests that collagen remodeling continues for up to 3 months after each session. Patients often report an initial “glow” and improved hydration after the first treatment, with visible scar softening and elevation becoming more apparent after the second and third sessions.
Clinical Evidence and Data-Driven Outcomes
The efficacy of PN-based treatments like Rejuran is supported by a growing body of clinical research. These studies often use standardized assessment tools, such as the Echelle d’évaluation clinique des cicatrices d’acné (ECCA) grading scale, to quantify improvements objectively. For instance, a study published in the Journal of Cosmetic Dermatology involving participants with atrophic acne scars found that after a series of PN injections, there was a statistically significant reduction in ECCA scores. High-frequency ultrasound imaging, which measures dermal thickness, has also been used to confirm an increase in the density of the skin’s structural layer following treatment.
Patient satisfaction surveys often complement this hard data. In one such evaluation, over 80% of subjects reported a moderate to significant improvement in their overall skin texture, smoothness, and the appearance of their acne scars after completing the treatment course. It’s important to look at the data holistically: while individual results vary, the consensus in the dermatological community is that Rejuran offers a safe and effective method for improving the appearance of mild to moderate atrophic acne scars by promoting genuine skin regeneration. The effects are considered long-lasting because they are based on the body building its own new collagen infrastructure, unlike fillers that are eventually metabolized.
Comparing Rejuran to Other Popular Acne Scar Treatments
Rejuran occupies a unique niche in the landscape of acne scar treatments. It’s not a direct replacement for lasers or fillers but rather a complementary option with distinct advantages. Here’s a comparative look:
- vs. Laser Treatments (Ablative & Non-Ablative): Lasers like CO2 or Fraxel work by creating controlled micro-injuries to trigger healing. They can be very effective for deeper scars but often come with significant downtime (redness, peeling for days or weeks) and a higher risk of post-inflammatory hyperpigmentation, especially in darker skin tones. Rejuran has minimal downtime and is considered very safe for all skin types. Lasers are more aggressive; Rejuran is more regenerative. They are often used together in a comprehensive treatment plan.
- vs. Dermal Fillers (e.g., Hyaluronic Acid): Fillers are great for an immediate “lift” of depressed scars. However, the results are temporary, typically lasting 6-18 months before the product is broken down. Rejuran’s results develop over time but are more durable because they are based on your own tissue. Fillers simply fill a space; Rejuran helps your skin rebuild that space.
- vs. Microneedling (with or without RF): Microneedling also stimulates collagen by creating tiny channels. When combined with Rejuran (the solution is applied topically during needling or injected after), the effects can be synergistic. The needles create pathways for the PN to penetrate deeper, potentially enhancing the overall outcome.
The choice between these treatments is not a matter of which is “best,” but which is most appropriate for your specific scar type, skin condition, downtime tolerance, and desired outcome. A consultation with an experienced dermatologist is essential for crafting a personalized plan, which may involve a combination of these technologies for optimal results.