CO2 laser training: what a first course should cover
A first fractional CO2 laser course should teach five things before you treat anyone alone: how the laser injures skin, which patients to turn away, how to protect eyes and airways, how infection differs from normal healing, and the rules for the device. It should also include patients you treat under supervision and see again while they heal.
That last part matters most. Infection, the most common cause of scarring, usually shows up several days after treatment, not during it [2]. A course that ends when the laser is switched off leaves out what beginners find hardest.
How the CO2 laser injures skin
The CO2 laser has one target in skin: water. Because skin is mostly water, the beam vaporises tissue wherever it lands, whatever the pigment, and leaves a rim of heat-damaged tissue around each wound [1]. A fractional device splits the beam into many microbeams. Each makes a narrow column of ablation into the dermis, surrounded by untouched skin, so the surface heals far faster than after full-surface ablation [1].
The energy of each microbeam changes how deep the column goes, and deep columns reach the dermis where scars remodel [1]. You should leave knowing what a change on the device does to the skin. The settings themselves are learned on a specific device, for a specific indication, with a supervisor.
Patient selection starts with skin type and healing history
Many avoidable problems are decided at the consultation. A review of fractional CO2 complications names the history that matters. Poor wound healing, keloids or hypertrophic scars may argue against aggressive resurfacing. Patients who tan easily risk hyperpigmentation, and a weakened immune system raises the risk of infection [2]. Laser injury can also trigger skin diseases such as vitiligo and psoriasis [2].
The EU device rules point the same way. Manufacturers of resurfacing lasers must take account of skin type, degree of tanning and photosensitising medicines or cosmetics, and reduce the risks of burns, scars and pigment change [4]. Their instructions must advise a medical consultation, including an examination of the skin to be treated. Devices that change appearance permanently must not be used on anyone under 18 [4].
Eyes, plume and fire are part of the training
Eye protection is mandatory for everyone in the treatment room [1]. The CO2 beam is absorbed in the cornea rather than focused on the retina, which makes it only marginally safer for the eye than visible and near-infrared lasers. Dedicated goggles with side shields are recommended [1].
Dry gauze or cotton struck by the beam can catch fire, so drapes near the treated area are kept damp [1]. The plume can carry harmful material, including viable viral particles, so a dedicated smoke evacuator is recommended; masks alone are not enough [1].
Your employer has duties too. Under Directive 2006/25/EC the employer must assess optical radiation risks, including temporary blinding, explosion and fire. Exposed workers must receive training in safe working practices, protective equipment, and how to detect and report harm to their health [3].
Aftercare and the complications to recognise
Fractional ablation opens the skin barrier. The review describes aftercare built on gentle cleansing, protective ointments or dressings, and usually antibiotic and antiviral cover [2]. Infection typically appears as a local area of delayed healing, and inexperienced clinicians can find it hard to tell from normal healing [2]. Without prophylaxis, herpes simplex can spread across the whole face [2].
Contact dermatitis from aftercare products, including ones sold as natural, is hard to tell from infection while the skin is red and swollen [2]. The neck and chest scar more easily than the face, and the lower eyelid can be pulled into ectropion, especially after earlier lower-lid surgery [2].
What the EU device rules require since 2023
Lasers for skin resurfacing without a medical purpose are listed in Annex XVI of Regulation (EU) 2017/745. Their common specifications have applied since 22 June 2023 [4]. Manufacturers must provide training to users on safe and effective use, handling incidents, and recognising and reporting incidents that must be reported [4]. Their instructions must call for eye protection, no mirrors or reflective instruments, room ventilation where needed and a warning notice outside the room [4].
What to ask before you book a CO2 course
- How many patients will you treat yourself, under supervision? Watching shows the sequence; treating builds judgement.
- Will you see your patients again while they heal? Telling infection from normal healing is what inexperienced clinicians find hard [2].
- Is consultation taught on real patients? Including the ones to turn away.
- What laser safety is covered? Eyes, plume and fire, and what your employer must assess and train you in [3].
- Which device will you train on? Ask whether the manufacturer's user training for it is included or still needed [4].
A resurfacing laser for professional use is meant for people with proven qualification in its safe and effective use, so keep a record of every case you treat under supervision [4].
Read next
- Laser Plume in the Aesthetic Clinic: Protecting the Operator
- Treating Skin of Colour: Injectables and Devices Across Fitzpatrick Types
- Energy-Based Devices: What to Understand Before You Buy One