How to Prep Your Skin Before a Laser Treatment

Knowing what to do before a laser treatment is not a minor logistical detail. It is a clinical step that directly affects how the laser interacts with tissue, how well the skin heals, and how likely complications are to occur. Preparation is where a large share of outcomes are determined, before the device ever touches skin.

Most laser procedures work through a principle called selective photothermolysis. A specific wavelength of light is absorbed by a target chromophore, which might be melanin, oxyhemoglobin, or water, depending on the device being used. The surrounding tissue ideally absorbs far less energy, limiting collateral damage. The problem is that several common skin conditions and behaviors can blur that selectivity. A suntan, for example, loads the epidermis with extra melanin, making it far harder for the laser to discriminate between a brown spot and the surrounding skin. That is why most providers require patients to avoid deliberate sun exposure for two to four weeks before treatment.

Retinoids and exfoliating acids are another common source of pre-treatment complications. Products containing tretinoin, retinol, glycolic acid, or salicylic acid thin the stratum corneum and increase baseline skin sensitivity. Using them in the week or two before a laser session raises the risk of excessive irritation, prolonged redness, and in some cases superficial burns. Most protocols call for a pause of five to seven days minimum, and up to two weeks for stronger prescription retinoids.

Candidacy conversations need to include a full medication review. Photosensitizing drugs, including certain antibiotics such as doxycycline and tetracycline, some diuretics, and select antifungals, can dramatically change how skin responds to light energy. Patients taking these medications may need to delay treatment or, in coordination with their prescribing physician, temporarily stop the medication. Isotretinoin (Accutane) is in a category of its own. Because it impairs wound healing at a cellular level, most laser providers require a waiting period of six months to one year after the last dose before performing any ablative or resurfacing procedure.

For patients with darker skin tones, preparation is especially consequential. Fitzpatrick skin types IV through VI carry a significantly elevated risk of post-inflammatory hyperpigmentation because melanocytes in deeper skin are more reactive to thermal injury. Many providers address this by prescribing a pre-treatment course of hydroquinone or a compounded brightening agent for four to six weeks before the procedure. Device selection also shifts: Nd:YAG lasers at 1064 nanometers are generally preferred over shorter-wavelength devices for darker skin because melanin absorption at that wavelength is lower, reducing epidermal injury. For a deeper clinical breakdown of how different devices are matched to different skin types, an in-office skin assessment is the most reliable route.

Hydration and barrier integrity matter more than most patients expect. Laser energy is more predictable when the skin barrier is intact and well-hydrated. In the days leading up to treatment, using a simple, fragrance-free moisturizer supports consistent tissue response. Conversely, compromised skin, such as active eczema, rosacea flares, or open acne lesions in the treatment zone, is usually grounds for rescheduling. For related context, see our note on Laser for Cherry Angiomas: How Dermatologists Remove These Common Red Spots.

On the day of the appointment, patients should arrive with clean, product-free skin. Makeup, sunscreen, and topical creams can reflect or scatter laser energy unpredictably. Most providers will cleanse the skin again in-office, but arriving with a clean face reduces that variable. Numbing cream, if used, is typically applied 30 to 60 minutes before the procedure and requires specific instructions about timing.

Recovery varies considerably by device type. Non-ablative treatments such as IPL or 1540 nm fractional lasers often produce only mild redness for 24 to 48 hours, and patients can typically return to normal activities quickly. Ablative resurfacing with a CO2 laser or erbium laser involves more substantial downtime, with active weeping, peeling, and redness lasting seven to 14 days and residual pinkness persisting for weeks beyond that. Sun avoidance after treatment is not optional. New skin is highly vulnerable to UV-induced pigment changes, and consistent broad-spectrum SPF 30 to 50 use for several months post-procedure is standard clinical advice.

Cost varies by treatment type, geography, and provider. A single IPL session commonly runs 300 to 600 dollars. Fractional non-ablative treatments often fall in the 500 to 1,200 dollar range per session, while full-face ablative CO2 resurfacing can range from 1,500 to 5,000 dollars depending on depth and regional pricing. Most resurfacing protocols require more than one session.

The preparation phase is where patients have the most control over their outcomes. Following pre-treatment instructions is not bureaucratic box-checking. It is the clinical foundation on which the procedure operates.

Related reading: Pulsed Dye Laser vs IPL for Rosacea Redness: What the Clinical Evidence Shows, Laser Treatment for Sun Spots on the Face: How It Works and What to Expect.