One of the biggest myths in scar treatment is that a scar is a scar — and that the same laser settings will work for everyone. They won’t.
Surgical scars, traumatic scars and acne scars are biologically different, behave differently in the skin, and respond differently to laser treatment. Treating them the same way isn’t just ineffective — it can increase the risk of poor outcomes.
This article explains why scar type matters and how evidence-based laser treatment is tailored accordingly.
Why Scar Type Matters
All scars form as part of the body’s wound-healing response, but the cause, depth, inflammation level and collagen organisation vary significantly depending on how the injury occurred (Ogawa, 2017).
These factors influence:
How the scar matures
How it responds to energy-based treatments
The risk of pigment change or worsening
This is why responsible scar treatment always starts with assessment, not a preset protocol.
Surgical Scars: Predictable Injury, Variable Healing
Surgical scars are created under controlled conditions, but healing is influenced by:
Surgical technique
Wound tension
Infection or delayed healing
Individual genetics
Early surgical scars often contain active fibroblasts and immature collagen, which can respond well to appropriately timed laser intervention (Waibel et al., 2013).
Laser considerations for surgical scars
Timing matters — too early or too aggressive can impair healing
Fractional laser treatment can encourage more organised collagen remodelling
Vascular components (redness) may respond to specific wavelengths
Evidence suggests that early, conservative laser treatment may improve scar quality and pliability when compared with delayed intervention alone (Kim et al., 2015).
Traumatic Scars: Irregular Damage, Complex Biology
Traumatic scars are far less predictable. Injuries such as lacerations, burns or blunt trauma often involve:
Uneven tissue damage
Prolonged inflammation
Variable depth across the scar
These scars frequently contain disorganised collagen and altered vascular supply, making them more challenging to treat (Gold et al., 2014).
Laser considerations for traumatic scars
Treatment often needs to be staged
Conservative settings reduce the risk of delayed healing
Texture and flexibility may improve before colour
Because traumatic scars are heterogeneous, multiple laser modalities or parameters may be required over time rather than a single approach.
Acne Scars: Loss of Structure, Not Excess Tissue
Acne scars are fundamentally different from surgical or traumatic scars. Most acne scars represent loss of collagen and dermal support, rather than excess scar tissue (Jacob et al., 2001).
Common types include:
Ice pick scars
Boxcar scars
Rolling scars
Each behaves differently under laser treatment.
Laser considerations for acne scars
Fractional laser technology is commonly used to stimulate collagen production
Multiple sessions are required due to gradual collagen synthesis
Improvement is often seen in texture rather than complete scar elimination
Aggressive treatment may increase the risk of post-inflammatory hyperpigmentation, particularly in darker skin tones, so parameter selection is critical (Alexis et al., 2016).
Why a Single Laser Protocol Fails
Using the same laser settings for every scar ignores key biological variables:
Scar age
Depth and thickness
Vascularity
Pigment risk
Location and skin tension
Evidence consistently shows that tailored treatment plans achieve better outcomes and lower complication rates than uniform protocols (Alster & Tanzi, 2003).
In practice, this means:
Different settings for different scars
Different treatment intervals
Sometimes deciding not to treat
What Patients Should Expect
Laser scar treatment is about improvement, not perfection.
Depending on scar type, patients may notice:
Softening and improved flexibility
Reduced redness or pigment irregularity
Gradual texture improvement over months
Complete scar removal is not realistic, and honest discussion upfront is essential for ethical care.
The Bottom Line
Surgical, traumatic and acne scars are not interchangeable — and treating them as such does a disservice to patients. Effective laser scar treatment requires understanding scar biology, choosing the right technology, and adjusting treatment over time.
Good outcomes come from individualised, evidence-based care, not one-size-fits-all protocols.
References
Alexis, A. F., Sergay, A. B., & Taylor, S. C. (2016). Common dermatologic disorders in skin of color: A comparative practice survey. Dermatologic Clinics, 34(4), 387–399.
https://doi.org/10.1016/j.det.2016.05.002
Alster, T. S., & Tanzi, E. L. (2003). Laser scar revision: A review. Dermatologic Surgery, 29(5), 462–470.
https://doi.org/10.1046/j.1524-4725.2003.29112.x
Gold, M. H., McGuire, M., Mustoe, T. A., Pusic, A., Sachdev, M., Waibel, J., & Murcia, C. (2014). Updated international clinical recommendations on scar management. Journal of Clinical and Aesthetic Dermatology, 7(2), 38–46.
Jacob, C. I., Dover, J. S., & Kaminer, M. S. (2001). Acne scarring: A classification system and review of treatment options. Journal of the American Academy of Dermatology, 45(1), 109–117.
https://doi.org/10.1067/mjd.2001.113451
Kim, J. E., Oh, S. H., Lee, J. H., & Kwon, S. H. (2015). Early postoperative treatment of surgical scars using a fractional laser. Annals of Dermatology, 27(1), 63–68.
https://doi.org/10.5021/ad.2015.27.1.63
Ogawa, R. (2017). Keloid and hypertrophic scars are the result of chronic inflammation in the reticular dermis. International Journal of Molecular Sciences, 18(3), 606.
https://doi.org/10.3390/ijms18030606
Waibel, J. S., Wulkan, A. J., Rudnick, A., & Shumaker, P. R. (2013). Treatment of burn scars with the fractional CO₂ laser. Journal of Drugs in Dermatology, 12(5), 565–569.