What should you know about q switched CO2 laser?

CO2 describes the laser medium and its strong absorption by water in skin. Q-switched describes a pulse-control method that releases energy in brief bursts. These words do not, by themselves, tell you whether the planned treatment is resurfacing, pigment-focused, or another procedure. The clinician chooses wavelength, pulse pattern and energy according to your skin type, concern and treatment area.

Depending on the plan, skin may look red, swollen, darker or crusted for a period after treatment. Healing requirements differ between a light, pigment-focused session and deeper resurfacing. A consultation should include the expected recovery, sun precautions and the possibility of temporary or longer-lasting colour change.

Before treatment, share your history of cold sores, raised scars, pigment changes, recent tanning, active rash, medicines and previous procedures. Follow the clinic’s instructions about skincare products and sun exposure. On the day, arrive with clean skin and protect your eyes as directed.

Afterward, use only the cleanser, moisturiser and wound-care products recommended for your treatment depth. Do not pick flakes or crusts. Avoid heat, friction, swimming and unapproved active ingredients until the surface has healed. Apply broad-spectrum sun protection once your clinician says it is appropriate, because ultraviolet exposure can worsen post-treatment pigmentation.

Contact the treating clinic promptly for worsening pain, spreading redness, increasing warmth, pus, fever, blisters near the eye or vision changes. Seek urgent medical care for severe swelling affecting breathing or eyesight. A mild, improving redness or sensitivity can occur after laser treatment, but symptoms that intensify rather than settle need review.

Ask which CO2 device and pulse mode are planned, what concern it is targeting, how deep the treatment will be, what recovery will look like, and how your skin tone changes the plan. Also ask about alternatives such as [CO2 Laser](/technology/co2-laser/), [CO2 Laser Resurfacing](/treatments/laser-and-energy/co2-laser-resurfacing/) or [Laser Skin Resurfacing](/treatments/laser-and-energy/laser-skin-resurfacing/).