It is an ablative laser.
It creates microscopic columns of injury in the skin.
Fractional CO2 Laser vs Glycolic Acid Peel
Fractional CO2 Laser: An ablative laser that vaporizes thousands of microscopic columns of skin, leaving untouched skin between them to heal from. It is the most effective in-office treatment for indented acne scars, and the one with the most downtime and the highest pigment risk.
Glycolic Acid Peel: A chemical peel that uses glycolic acid, the smallest of the fruit acids. It brightens dull skin, softens rough texture and fades flat brown marks. It works on the surface only, and it has to be neutralized on time.
Choose Fractional CO2 Laser if…
Choose for the biggest single improvement in indented acne scars or deep sun damage, accepting the most downtime and pigment risk.
- Boxcar or rolling acne scars
- Deep sun damage or wrinkles
- You can take a week or more off
Choose Glycolic Acid Peel if…
Choose to brighten dull skin and fade flat brown marks with little or no downtime.
- Dull skin or rough texture
- Flat brown marks or clogged pores
- You want little downtime
Alternatives, not combined
Can you have both?
Both resurface the skin. CO2 is much deeper; glycolic peels can maintain results months later.
Key differences
● Fractional CO2 Laser
● Glycolic Acid Peel
DowntimeNone → 2+ weeks
1–2 weeks
1–2 days
PainMinimal → Needs anesthesia or sedation
Needs anesthesia or sedation
Mild
Results showImmediately → 3+ months
1–3 months
Within days
How long it lastsWeeks → Years or permanent
Years or permanent
Weeks
Visits neededOne → Every few months
A short series (2–3)
A longer series (4–6+)
Cost per visit$ → $$$$$
$$$$
$
ReversibleYes, can be undone → No, permanent
No, permanent
No, fades slowly
What is it?
Fractional CO2 Laser
Glycolic Acid Peel
What is it?
Untreated skin speeds healing.
Skin between the columns supports recovery.
It is intensive.
It is stronger than a facial but less than fully ablative resurfacing.
History matters.
Pigment, keloid, herpes and isotretinoin history need assessment.
It is a supervised peel.
A glycolic acid peel is an alpha-hydroxy acid exfoliation.
The percentage is not the whole story.
Acidity, contact time and technique matter.
High-strength home use is unsafe.
The FDA warns against unsupervised strong peels.
History matters.
Irritation, recent procedures, herpes and pigment risk are reviewed.
What it treats
Evidence level
Fractional CO2 Laser
Glycolic Acid Peel
Strong evidenceMost established uses
Acne Scarring
Major improvement in many scar types.
Boxcar Scars
Smooths wide scars.
Wrinkles and Fine Lines
Tightens and smooths.
Dull Skin
Brightens quickly.
Moderate evidenceSome supportive research
Sun Spots
Clears sun damage.
Melasma
Helps alongside lightening creams.
Acne
Clears clogged pores.
Sun Spots
Fades spots with a series.
Not effective
—
Ice Pick Scars
Too superficial.
Can make it worse
Melasma
High risk of darkening.
Rosacea
Can worsen redness.
Rosacea
Stings and triggers flushing.
Treatment areas
Treatment areas
Face; the selected area depends on the concern and treatment plan.
Face; the selected area depends on the concern and treatment plan.
Skin tones
Skin tone
● Fractional CO2 Laser
● Glycolic Acid Peel
Lighter skin
Some risk
Prolonged redness possible.
Low risk
Light flaking.
Medium skin
Higher risk
Dark marks are common; pre-treatment helps.
Low risk
Start at lower strengths.
Deeper skin
Higher risk
Highest pigment risk of these treatments; low-density settings and an experienced provider are essential.
Some risk
Over-strong or over-long peels can leave dark marks; start low.
How it works
Fractional CO2 Laser
Glycolic Acid Peel
How it works
Diagram explanation
Creates tiny treatment channels: Laser energy absorbed by water removes narrow columns of tissue. Untreated skin supports healing: Skin between the channels helps the surface repair. Collagen remodels over time: Repair can improve selected scars, lines, and texture.
Schematic illustration. Technique and response vary. This explains a mechanism and does not specify treatment settings.
The peel is applied: A clinician selects the formulation for the skin and goal. Outer cells loosen: Glycolic acid reduces cohesion in the superficial skin layers. The surface renews: Controlled exfoliation can improve selected superficial concerns.
Schematic illustration. Technique and response vary. This explains a mechanism and does not specify treatment settings.
Before your treatment
Fractional CO2 Laser
Glycolic Acid Peel
2–4 weeks before
Sun and pigment cream: No sun, and do not arrive tanned.
Sun and pigment cream: On deeper skin tones a pigment-blocking cream usually starts two to four weeks ahead.
Plan ahead: Time off and supplies: Book the time off, arrange a driver if sedation is planned, buy plain petrolatum and a gentle cleanser, and plan a week at home.
2 weeks before: Sun and tanning: No tanning or sunburn for 2 weeks beforehand, and sunscreen daily.
Pigment cream: On deeper skin tones, and in anyone who marks easily, many providers pre-treat for 2 to 4 weeks with a pigment-blocking cream to lower the chance of dark patches.
Before you book: Events: Do not book a first peel in the days before an event.
The week before
Actives and smoking: Stop retinoids, benzoyl peroxide and acids.
1 to 2 days before: Antiviral tablets: Antiviral tablets start a day or two before and continue for several days after, since an outbreak in healing skin can scar.
Actives and hair removal: Stop retinoids (tretinoin, adapalene, retinol), benzoyl peroxide and exfoliating acids 3 to 5 days before.
Actives and hair removal: Stop waxing, threading and hair removal creams on the area for a week.
Day of treatment
Fractional CO2 Laser
Glycolic Acid Peel
Arrival & prep
Skin is examined and photographed.
Skin is checked and usually photographed, and you confirm what you stopped using.
Treatment
The handpiece is passed or stamped over each zone.
Expect rapid clicking, a burning smell, and a smoke evacuator running. Heat builds fast and feels hot rather than sharp. A full face takes 30 to 60 minutes, genuinely painful without proper anesthesia. The burning carries on for an hour or two.
Skin is cleaned and degreased, eyes and lips protected, and the acid brushed on in a set order.
The provider watches for even pinkness, then neutralizes or floods the skin with water. It takes about 20 to 30 minutes. The sting is hot and prickly, climbs over 2 to 5 minutes, then stops seconds after neutralizing. Say so if it turns to burning, which is the signal to stop early.
Before you leave
Skin is deep red, hot, swollen and weeping clear fluid, with a fine grid pattern visible.
Pink, tight skin, a bit like mild windburn.
After your treatment
Fractional CO2 Laser
Glycolic Acid Peel
First 24 hours
Days 1 to 3: Swelling peaks on the first or second morning and can partly close the eyes.
Day 1 to 3: Skin feels dry and rough and can look slightly darker before it sheds.
Days 2–7
Days 3 to 14: The skin turns bronze or grid-patterned brown, then flakes and sheets off, showing bright pink skin.
Day 3 to 5: Flaking finishes and skin looks brighter underneath.
Weeks 2–4
Week 3 to Month 12: Redness fades slowly, a month on light settings and three months or longer on aggressive ones.
Week 1 to 2: A few spots in the first week or two as clogged pores clear are common, and settle on their own.
Time to results
1–3 months, improving to 6
Within days
How long results last
Years
Weeks to months with skincare
Risks
Risks
- Dark patches
- Redness that will not settle
- Pale or white patches
- An acne or milia flare
- Itching that is severe
- Most side effects of a superficial glycolic peel are mild and expected
- Dark patches
- Prolonged redness
- A cold sore outbreak
- Persistent itching or rash
Cost
Per session
A full-face session in the US usually runs $1,000 to $3,000, varying by city, device, depth, and whether sedation or an operating room is involved.
In the US a superficial glycolic peel usually runs about $100 to $250 a session, depending on the city, a medical office versus a spa, and whether it is bundled with a facial.
Insurance
Insurance does not cover resurfacing for acne scars, which is classed as cosmetic.
Insurance does not cover peels done for brightness, texture or post-acne marks.
Questions
Fractional CO2 Laser
Glycolic Acid Peel
Individual Questions
How much downtime does fractional CO2 really need?
Five to ten days at home. Swelling and oozing days one to three, bronzing and sloughing days three to seven, and by day seven to ten the surface has closed and mineral makeup is usually allowed. Redness then fades over weeks to a few months.
Will it get rid of my acne scars?
It improves them substantially, more than any other single treatment, but it does not remove them. Rolling and boxcar scars respond best, icepick scars least, and mixed scarring usually needs subcision or TCA CROSS too.
Is it safe on deeper skin tones?
Experienced providers do it using lower density, longer intervals, and pigment creams before and after. Dark marks are common and fade over months. The rare risk of permanent pigment loss is why many people with deeper skin tones choose microneedling instead.
How many sessions will I need?
One to three, 6 to 12 weeks apart, judged six months after the last one.
Does it hurt?
Yes, without proper anesthesia. Numbing cream alone is not enough for a full face, so nerve blocks, injected anesthetic or oral sedation are standard, and burning continues for an hour or two afterward.
Can I have it before a wedding or a big event?
Only with months of margin. Skin looks worse before it looks better, and redness can last one to three months. Six months ahead is a reasonable minimum.
How is a glycolic peel different from a salicylic peel?
Glycolic is water-soluble and works on the surface, so it suits dullness, rough texture and brown marks. Salicylic is oil-soluble and gets inside the pore, so it suits blackheads and whiteheads. Some providers blend the two.
What does neutralizing mean, and why does it matter?
Glycolic keeps working until it is stopped, either with a basic solution or by flooding the skin with water. The provider watches a timer and the skin at the same time. Peels left on too long are how burns happen.
Is a higher percentage better?
Not on its own. The pH and the contact time matter as much as the number. A well-judged 30% peel can do more than a careless 70% one.
Will I actually peel?
Often only lightly, and sometimes not at all. Fine flaking for a day or two is usual, and no flaking does not mean it failed.
How many will I need?
4 to 6 peels, 2 to 4 weeks apart, then maintenance every couple of months. One peel gives roughly a week of brightness.
Can I have one if I use tretinoin?
Yes, and skin on a retinoid usually peels more evenly. Stop it about 3 to 5 days before and restart once flaking has finished.
Keep exploring.
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Glycolic Acid Peel
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