Technology
Shallow vs deep fractional resurfacing — and hybrid plans explained
How clinicians plan shallow, deep and hybrid fractional CO₂ resurfacing with depth and density, which concerns each fits, and why one platform should do all three.
Fractional CO₂ resurfacing is often discussed as if it were one treatment. In practice it is a range. The same platform can deliver a light surface refresh or a deeper scar-remodeling plan, and the difference comes down to two operator decisions: how deep the treatment columns reach and how densely they are placed.
On AlexaCO2.com we describe three resurfacing strategies — Shallow, Deep and Hybrid. They are not named software presets. They are planning concepts the clinician builds with depth and density controls, and they are a practical way for a clinic to organize its CO₂ menu.
The two dials that matter most
A fractional scanner places a grid of microscopic columns across the treatment area and leaves intact skin between them. Every plan is a combination of six levers — power, dwell time, density, depth, passes and scan pattern — but two of them dominate what the patient experiences:
- Depth decides which level of the skin the treatment works at.
- Density decides how much of the area is treated, and therefore how much correction and how much recovery a session involves.
A conservative rule taught in CO₂ training: when more correction is needed, add density cautiously before chasing depth, and reassess across a series rather than maximizing one session.
Shallow: surface-focused fractional resurfacing
A shallow strategy keeps the columns near the surface.
Typically considered for: texture, tone, fine lines, enlarged pores and early photoaging.
What it means for the practice: lighter recovery, often planned as a series, and a good fit for patients who cannot take much downtime. It is also a useful entry point for patients new to CO₂.
Deep: deeper fractional remodeling
A deep strategy places columns further into the skin.
Typically considered for: acne scars, surgical and traumatic scars, etched lines and more advanced photoaging.
What it means for the practice: more correction per session, more recovery and more careful patient selection. Scar work in particular tends to live here, because scars are structural rather than a surface-only concern. See our article on building an acne-scar service line.
Hybrid: more than one level in one plan
A hybrid strategy combines surface-focused and deeper treatment so that more than one tissue level is addressed within the same plan — for example, deeper work on scarred zones with lighter treatment for overall texture.
What it means for the practice: a plan that reflects how real patients present. Many have both surface concerns and deeper structural ones; a hybrid plan addresses both without forcing everything to one intensity.
Side by side
| Shallow | Deep | Hybrid | |
|---|---|---|---|
| Where the treatment works | Near the surface | Deeper into the skin | Both, in one plan |
| Typical concerns | Texture, tone, fine lines, early photoaging | Acne scars, surgical scars, etched lines | Mixed surface and structural concerns |
| Recovery posture | Lighter; often a series | Longer; careful selection | Planned to the deepest component |
| Main planning dial | Density | Depth | Both, by zone |
This table describes planning concepts, not settings. Actual depth, density, power and pass counts are set by the clinician for each indication, skin type and consented recovery, and they are taught in clinical training against verified protocols.
Skin type sets the limits
Ablative CO₂ triggers an inflammatory response, and in skin with more melanin that raises the risk of post-inflammatory hyperpigmentation. Lighter Fitzpatrick types are the standard candidate range; darker types call for conservative density and depth, longer intervals and disciplined post-care. Pigment changes can appear days or weeks after treatment, so a clean immediate result is not proof of a safe dose. When risk factors stack, step down rather than up.
Zone-by-zone thinking
Experienced operators rarely treat a face at one setting. Thinner or higher-risk areas such as the periocular region and neck are treated more conservatively than thicker cheek skin. Thinking in strategies makes that natural: a hybrid plan may simply be deeper work on cheek scarring and shallow work elsewhere.
Why one platform should do all three
If a device can only deliver one intensity band, the practice ends up either undertreating scars or overtreating patients who wanted a refresh. A platform that supports shallow, deep and hybrid planning lets one capital purchase serve:
- maintenance-minded patients who want a light series;
- corrective patients with scars or etched lines;
- the large middle group with both.
Alexa CO₂ Aesthetic combines fractional and ablative 10,600 nm delivery with a fractional scanner (scan field up to 30 mm, customizable scan shapes) and touchscreen control, so the same platform can carry all three strategies. See the technology and the skin resurfacing page.
How to evaluate this in a demo
- Ask the vendor to show how depth and density are set and displayed.
- Ask how the scanner handles small or irregular zones.
- Ask what the training program teaches about rung selection and skin types.
- Ask which handpieces and scan shapes are included in your quotation.
For the underlying physics, read what 10,600 nm means. To see the platform yourself, book a demonstration.