Subcision for Acne Scars – Efficacy and Indications of Subcision

Depending on the severity and structure of acne scars, each skin type requires an appropriate treatment method. Among the techniques currently in use, subcision for acne scars has become one of the most common approaches thanks to its ability to target the base of scars and improve depressed skin. But how effective is this method, and when should it be chosen to achieve the best results?

What Is Subcision for Acne Scars?

Subcision is a scar treatment technique that has been applied in dermatology since 1995. This method directly targets the fibrous tissue beneath the scar base—the main factor pulling the skin downward and preventing natural recovery. Using a specialized medical needle or blunt cannula, the physician inserts the instrument horizontally under the skin to sever these fibrous bands, thereby “releasing” the scar base and allowing the skin to rise naturally.

Additionally, subcision creates controlled micro-injuries that stimulate collagen production, supporting skin regeneration and gradual scar filling over time. By addressing the root cause of atrophic acne scars, this procedure is often considered a cornerstone in the treatment of long-standing scars.

Clinical Evidence of Subcision Efficacy

Subcision is regarded as one of the most effective techniques for acne scar management, supported by strong scientific evidence. Its primary mechanism involves cutting through the fibrous bands tethering the scar while simultaneously stimulating collagen synthesis and new tissue formation.

The efficacy of subcision has been confirmed through multiple clinical studies. In a U.S. study by Dr. Murad Alam and colleagues, 90% of patients with acne scars reported significant improvement, with an average reduction in scar depth of 50–60% within just six months. Similarly, a 2019 study by Shashank Bhargava demonstrated positive outcomes when subcision was combined with microneedling: 95.6% of participants showed marked improvement, and nearly 18% achieved over 75% improvement within three months after the final session.

Typically, treatment requires 3 to 6 sessions spaced 4–6 weeks apart, depending on scar severity and individual healing capacity. Noticeable improvement is seen after each session and continues progressively. Combining subcision with collagen-stimulating technologies such as fractional CO₂ laser, RF microneedling, or mesotherapy can further enhance results and shorten overall treatment duration.

When Is Subcision Indicated—or Not?

While subcision is highly effective, it is not suitable for every patient.

This method is commonly indicated for rolling scars and deep boxcar scars—two types often caused by severe acne, chickenpox, or traumatic skin injury. It is also appropriate for patients seeking a combination approach to accelerate healing and maximize improvement. However, candidates should not have active skin infections, underlying health conditions that impair wound healing, or be on medications that hinder recovery.

Conversely, subcision is not the best option for ice pick scars, which lack prominent fibrous bands to release. In such cases, TCA CROSS treatment is usually preferred. The procedure is also contraindicated in individuals with a history of keloids, active skin infections, bleeding disorders, or those taking anticoagulants or oral retinoids (such as isotretinoin) within the past 12 months. Final treatment decisions must be made by a dermatologist after thorough assessment of scar characteristics and medical history.

Current Subcision Techniques

Using Medical Needles

The most common approach involves specialized needles such as Nokor needles or large hypodermic needles with sharp tips. The physician inserts the needle at an angle beneath the skin and moves it back and forth to sever fibrous bands tethering the scar. This technique is ideal for deep, well-defined scars requiring precise intervention. However, it may cause more swelling and bruising than other methods.

Using a Blunt-Tip Cannula

An alternative is the use of a blunt-tip cannula—a flexible tube inserted under the skin to gently separate fibrous tissue while minimizing trauma to surrounding vessels and nerves. This method is especially suitable for widespread rolling scars or deep scars over large areas, offering reduced pain and bleeding.

Using Medical CO₂ Gas

Subcision with pressurized medical CO₂ gas (e.g., TriFill Pro device) has emerged as a less invasive option. High-pressure gas is delivered under the skin to separate fibrous bands without needles, thereby reducing bruising and shortening recovery time. This approach is best suited for newer scars with softer fibrous tissue or for patients reluctant to undergo needle-based procedures. However, results may be limited in older, deeper, or fibrotic scars.

Conclusion

Subcision is not merely a simple procedure but a specialized intervention that requires careful evaluation and skilled execution. Its success depends on proper patient selection, the chosen technique, and individual skin response. Instead of self-assessing or deciding based on assumptions, patients should undergo consultation at a dermatology clinic to ensure safe and accurate treatment planning. A personalized treatment plan remains the key to restoring healthy skin and achieving significant scar improvement over time.

Frequently Asked Questions About Subcision

1. Is subcision painful?

Some discomfort can occur during the procedure, especially when the needle contacts fibrous tissue. However, topical anesthesia is routinely applied to minimize pain.

2. How long does recovery take?

Healing typically ranges from 7 to 14 days, depending on individual skin response and the physician’s technique. Less invasive methods such as cannula-based or CO₂ gas subcision generally allow faster recovery.

3. Should subcision be combined with other treatments?

Yes. Subcision is often performed alongside treatments like mesotherapy, fractional CO₂ laser, or microneedling to accelerate scar filling and optimize results.

4. Is subcision safe?

Although effective, subcision is a minor surgical procedure and carries potential risks if not performed correctly or if aftercare is neglected, such as:

• Prolonged bruising, especially when multiple entry points are used.

• Skin infection due to poor aseptic technique or inadequate aftercare.

• Post-treatment dermatitis with redness and tenderness.

• Hypertrophic or keloid scarring in predisposed individuals.

• Rare vascular or nerve injury causing prolonged numbness or discomfort.

5. How much does subcision cost?

At Wedo Skin Clinic, subcision costs range from 500,000 – 3,500,000 VND, depending on the treatment plan and scar severity (exclusive of 8% VAT).

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