Dr. Sierro’s protocol is customized for each indication — the laser settings, depth, density, and number of sessions are selected based on the specific skin concern, its severity, and the patient’s skin type.
01
Acne Scar Revision with CO2 Laser
Atrophic acne scars — the depressed, indented scars that represent the most common long-term sequela of cystic and inflammatory acne — are among the most demanding indications for fractional CO2 laser and the most rewarding when treated correctly. Unlike hypertrophic scars, which are raised, atrophic scars represent a deficit of dermal volume — a structural loss of collagen and subcutaneous tissue that gives the scar its characteristic depression below the surrounding skin surface. Fractional CO2 laser addresses this in two ways: by ablating the sloped, irregular scar wall to smooth the transition between the scar base and the normal skin, and by stimulating new collagen synthesis that progressively fills the scar base and elevates the depressed surface toward the skin level.
Atrophic acne scars are classified by morphology — boxcar scars (sharply defined vertical walls and a flat base, most responsive to fractional CO2), rolling scars (gradual sloping walls from tethering fibrous bands, improved by combining CO2 with subcision), and icepick scars (deep, narrow, V-shaped channels extending into the dermis, best addressed by TCA cross chemical reconstruction or punch excision before or combined with CO2 treatment). Dr. Sierro evaluates each patient’s acne scar morphology at consultation and designs a multimodal protocol — which may combine fractional CO2 with subcision, punch excision, TCA cross, fillers, or RF microneedling — to address every scar subtype systematically.
Best For: Boxcar and rolling atrophic acne scars, Fitzpatrick I–III; combined with subcision for rolling scars, TCA cross for icepick scars; 1–3 sessions for mild-moderate scarring, 3–5 for severe
02
Surgical Scar Revision with CO2 Laser
Surgical scars that have healed with surface irregularity, textural mismatch, hypertrophy, or hypopigmentation relative to the surrounding skin are among the most impactful indications for fractional CO2 laser resurfacing at Kare — and an area where the combined expertise of Dr. Karamanoukian (who performed the original surgery and understands the wound healing trajectory) and Dr. Sierro (who selects the laser parameters for the specific scar characteristics) produces outcomes unavailable elsewhere.
Fractional CO2 laser scar revision is performed at 3–6 months post-operatively, after the scar has completed its active remodeling phase and settled into its mature state. The laser ablates the textural irregularity at the scar surface, stimulates collagen remodeling within the scar tissue, and normalizes the pigmentation boundary between the scar and surrounding skin. Facelift scars, blepharoplasty scars, breast reduction scars, abdominoplasty scars, and rhinoplasty scars all benefit from this approach. For traumatic scars on the face following injury or laceration, Dr. Sierro begins fractional CO2 resurfacing as early as 6–8 weeks after wound closure, exploiting the early scar remodeling window for maximum collagen influence.
Best For: Post-surgical scar surface revision 3–6 months post-operatively; traumatic facial scars 6–8 weeks after wound closure; facelift, eyelid, breast, and abdominoplasty scar texture improvement
03
Fine Line & Superficial Wrinkle Treatment
For fine lines — the superficial epidermal rhytides that represent early photoaging, repetitive facial expression, and declining collagen density — fractional CO2 laser at conservative settings produces dramatic improvement with a single session. The ablative column removes the wrinkled epidermal surface while the collagen-stimulating thermal zone thickens the dermis beneath it, simultaneously eliminating the surface irregularity and rebuilding the dermal scaffold that prevents future lines from forming at the same depth. Fine lines around the eyes (crow’s feet), the upper lip (perioral lines), and the forehead respond particularly well, with most patients achieving 60–80% improvement in line visibility after one session.
The perioral area — the vertical fine lines that develop above the lip and radiate outward, commonly called “smoker’s lines” even in non-smokers — is one of the areas where fractional CO2 laser most significantly outperforms competing technologies including RF microneedling, ultrasound, and non-ablative lasers, because only ablative resurfacing physically removes the wrinkled surface and stimulates collagen at the full depth of the rhytide.
Best For: Perioral and periorbital fine lines; diffuse facial fine rhytides from photoaging; forehead and glabellar texture; single-session significant improvement in Fitzpatrick I–III patients
04
Deep Wrinkle & Advanced Photoaging Treatment
For deeper rhytides — the nasolabial folds, marionette lines, deep forehead furrows, and neck rhytides representing decades of combined UV damage, repetitive muscular activity, and collagen depletion — fractional CO2 laser at higher energy and density settings, or multiple sequential sessions, provides the most significant non-surgical improvement available. Each session produces progressive dermal thickening and surface smoothing, with cumulative results that turn back the clinical clock of photoaging by an estimated 5–10 years of apparent skin age in optimal responders.
Full-face and full-neck fractional CO2 resurfacing — treating not just isolated zones but the complete facial surface — achieves uniformity of skin tone, texture, and reflectance that isolated treatment of individual lines cannot. Many patients who have pursued injectable treatments for deep wrinkles without adequate surface improvement find that combining filler (for volumetric correction) with fractional CO2 (for surface remodeling) produces a more natural, comprehensive result than either treatment alone. Dr. Sierro designs these combination rejuvenation protocols at consultation, sequencing the CO2 laser and injectable treatments appropriately.
Best For: Advanced photoaging with deep rhytides; moderate to severe sun damage; full-face rejuvenation; combination with injectables for comprehensive facial restoration; 1–2 sessions for most patients
05
Sun Damage & Pigmentation Correction
Los Angeles and Santa Monica’s year-round sunshine makes cumulative UV damage — solar lentigines (sun spots), diffuse dyspigmentation, rough texture from chronic photoaging, sallow or gray tone from epidermal derangement, and early actinic keratoses — among the most common resurfacing indications in Dr. Sierro’s practice. Fractional CO2 laser addresses all components of sun damage simultaneously: the ablative action removes the pigmented, dyschromic epidermal surface and the irregular superficial stratum spinosum, while the thermal coagulation stimulates new collagen in the underlying dermis that was progressively depleted by years of UV-induced matrix metalloproteinase activity. The result is simultaneously a pigmentation reset, a texture normalization, and a structural rebuilding of the photodamaged dermis.
For patients with primarily pigmentary concerns and milder texture issues, Dr. Sierro may recommend the Lutronic Thulium laser or Clear + Brilliant rather than full CO2 resurfacing — achieving pigmentation correction with less downtime and a more favorable safety profile for patients with darker Fitzpatrick skin types where aggressive CO2 resurfacing carries a risk of post-inflammatory hyperpigmentation.
Best For: Solar lentigines, diffuse sun damage, uneven skin tone and texture, chronic photoaging, Fitzpatrick I–III for full-power CO2; Lutronic Thulium for pigmentation in Fitzpatrick III–V
06
Skin Quality Enhancement & Collagen Rebuilding
Beyond the treatment of specific lesions or scars, fractional CO2 laser is the most powerful available non-surgical intervention for global skin quality enhancement — rebuilding dermal collagen density, improving skin tone uniformity, reducing pore size, firming lax epidermis, and establishing the luminous, healthy surface texture that reflects well-structured, well-hydrated dermis beneath. For patients who cannot identify a single specific concern but describe generally “looking tired” or finding that their skin has lost its youthful quality and reflectance, a full-face fractional CO2 session addresses the diffuse structural deterioration of photoaging that produces these non-specific but deeply bothersome aesthetic changes.
Because significant collagen production continues for up to 6 months after each fractional CO2 session, the full extent of skin quality improvement is not visible until the collagen remodeling process is complete. Dr. Sierro educates every patient about this timeline at consultation — setting the expectation that the skin will continue to improve progressively after treatment, rather than immediately, and that the best results are typically seen 3–6 months after the last session.
Best For: Global skin quality and collagen rebuilding; diffuse photoaging without dominant single concern; annual or biennial skin renewal treatment; combination with Morpheus8 for simultaneous deep and surface remodeling