If you’ve been thinking about trying a Co2 laser treatment to improve your skin, you're not alone. Many people go for this method to deal with acne scars, wrinkles, and sun damage. The Co2 laser is a powerful skin resurfacing treatment that removes damaged skin layers, helping reveal smoother and healthier skin underneath. But like with any skin procedure, there are potential side effects that you should know about before you book your appointment.

This guide walks you through the most common Co2 laser side effects, why they happen, and how you can reduce your chances of dealing with them. We’ll also go over what you can do before and after treatment to help your skin heal better.

What Is Co2 Laser Treatment?

Co2 laser (short for carbon dioxide laser) is a type of fractional laser treatment that uses light energy to remove the outer layers of skin in a very controlled way. It works by creating tiny injuries in the skin so the body can start a natural healing process. This process stimulates new collagen production, which helps with skin tightening and smoother texture over time.

It’s commonly used to treat:

• Fine lines and wrinkles

• Deep acne scars

• Uneven skin tone

• Stretch marks

• Skin laxity

• Sun spots and pigmentation

While it can deliver great results, it’s not a one-size-fits-all treatment. Your skin type, age, medical history, and aftercare all play a role in how your skin reacts.

Why Side Effects Happen

Side effects from Co2 laser treatments happen mostly because the skin is being intentionally damaged so it can heal itself stronger. While most reactions are part of the healing process, some can become more serious or uncomfortable if not managed properly. Your skin is basically undergoing a controlled wound, and how your body heals that wound will determine your recovery.

Side effects can vary based on the strength of the laser, the skill of the person doing the procedure, and how well you follow the aftercare.

Common Co2 Laser Side Effects

Most people will experience at least a few side effects after a Co2 laser treatment, especially if it’s their first time or if the treatment is done at a deeper level. Here's what you might notice:

Redness and Swelling

Redness is the most common reaction. It can last a few days to a few weeks depending on how deep the laser went. Swelling, especially around the eyes or lips, may occur in the first few days after the treatment.

Peeling and Flaking

As the damaged skin begins to heal, the outer layers will peel or flake off. This is a normal part of recovery, but it can look a bit alarming if you're not expecting it.

Itching and Dryness

The skin may feel tight, dry, or itchy as it starts to repair itself. It’s important not to scratch or pick at your skin during this stage, as that can increase the risk of scarring or infection.

Temporary Skin Discoloration

Some people notice their skin looks lighter or darker after treatment. This is usually temporary but can last several weeks. It’s more likely to happen if you have darker skin or don’t protect your skin from the sun.

Breakouts or Small Bumps

It’s not uncommon to get small white bumps or pimples during the healing process. This can be a result of clogged pores or irritation from the ointments used during recovery.

H4: Mild Crusting or Scabbing

If the treatment was intense, you might see some scabs form. These should fall off on their own and shouldn’t be picked at.

Less Common But Serious Side Effects

While rare, there are some side effects that you need to take seriously:

Infections

Any time the skin is broken, there's a risk of infection. Signs include increased redness, yellow or green discharge, and fever. Always contact your provider if you notice these.

Scarring

Improper aftercare or picking at your skin can lead to permanent scarring. This is one of the main reasons why following instructions is so important.

Hyperpigmentation or Hypopigmentation

In some cases, the skin may stay darker (hyperpigmentation) or lose color (hypopigmentation) for months. People with medium to dark skin tones are more at risk.

Delayed Healing

If your immune system is weak, you smoke, or you’re not using proper skincare during recovery, your skin may take longer to heal.

How to Avoid or Minimize Side Effects

While some reactions are unavoidable, there are several things you can do to help your skin heal properly and reduce your chances of complications.

Choose a Qualified Provider

Always go to a licensed and experienced professional. Not all medspas or clinics are created equal. A skilled provider will know how to adjust the settings for your skin type and concerns, reducing the risk of going too deep or damaging your skin.

Follow Pre-Treatment Instructions

You may be asked to stop using retinoids, glycolic acid, or acne treatments for a few days before your appointment. If you have a history of cold sores, you might also be given antiviral medication to prevent a flare-up. These steps help prepare your skin and reduce the risk of complications.

Be Realistic About Recovery

Your skin will not look perfect the next day. You will go through a phase of redness, peeling, and maybe swelling. Give it time. Don’t schedule important events right after your treatment. Healing usually takes about 7–10 days, but redness can linger longer.

Stick to Aftercare

Use the products your provider recommends, usually including a gentle cleanser, healing ointment, and sunscreen. Don’t try to speed up peeling or force anything off your face. This can damage your new skin and increase scarring.

Keep your skin clean, avoid direct sunlight, and don’t use any harsh products until your provider says it’s safe.

Avoid Smoking and Alcohol

Both of these slow down the healing process. If you want your skin to bounce back faster and look better, it’s best to avoid them for at least a few days before and after the treatment.

Stay Hydrated and Rest

Drinking water and getting enough sleep supports your body’s natural repair process. Your skin needs that boost during recovery.

Who Should Avoid Co2 Laser Treatments?

While Co2 laser treatments are great for many skin concerns, they’re not right for everyone. If you have any of the following, make sure to talk to your provider before moving forward:

• Active acne or open wounds

• Very dark skin tone (higher risk of pigmentation issues)

• A history of keloid scars

• Immune disorders or conditions that slow down healing

• Are pregnant or breastfeeding

There might be safer options available, such as gentler laser treatments or chemical peels, depending on your skin condition.

What to Expect After the Treatment

Here’s a rough timeline to give you a better idea of what recovery might look like:

Day 1–2: Redness, swelling, and slight stinging. Skin may feel hot, like a sunburn.
Day 3–5: Peeling begins. Your skin might look patchy.
Day 6–7: Peeling slows down. Pink, sensitive skin is revealed.
Week 2–3: Redness begins to fade. You can use gentle makeup to cover up if your provider allows.
Week 4 and beyond: New skin continues to strengthen. Collagen production improves texture and firmness over time.

Full results from the Co2 laser may not be visible until after 2–3 months, as the collagen rebuilding process takes time.

FAQs

How painful is Co2 laser treatment?
It can be uncomfortable, but most people are given numbing cream beforehand. Some clinics also offer mild sedatives or local anesthesia.

Can I wear makeup after a Co2 laser?
Usually, you’ll need to wait at least 7–10 days before wearing any makeup. Always ask your provider when it’s safe.

Is Co2 laser good for all skin types?
It works best for lighter skin tones. Darker skin types need to be evaluated carefully because of the higher risk of pigmentation changes.

Can I go back to work the next day?
It depends on your job and how you feel. Most people prefer to take a week off due to redness and peeling.

Will I need more than one session?
Some people see great results after one treatment. Others may need two or more depending on their skin goals.

Conclusion

The Co2 laser is a solid option for improving skin texture, reducing scars, and tackling signs of aging—but it’s not without risks. The most common side effects are part of the healing process, but there are ways to make that process easier. By choosing an experienced provider, preparing your skin, and following aftercare closely, you can avoid most complications and enjoy smoother, healthier skin in the long run.