A woman lies on a treatment bed while a provider in black gloves uses a handheld ExoLase laser device on her eye area. She wears protective eye shields, and another person in a dark navy scrub top is visible at the left edge. Exolase Laser treatment is being used to resurface the skin at Le Petit Saint clinic in mayfair. A woman lies on a treatment bed while a provider in black gloves uses a handheld ExoLase laser device on her eye area. She wears protective eye shields, and another person in a dark navy scrub top is visible at the left edge. Exolase Laser treatment is being used to resurface the skin at Le Petit Saint clinic in mayfair.

What Is Exolase One? A Guide to London's Exclusive Fused Erbium Laser

There is a growing appetite in aesthetic medicine for treatments that work with the skin's own repair process rather than against it, delivering visible change without the lengthy recovery once associated with laser resurfacing. Exolase One, available exclusively at Le Petit Saint, sits at the centre of this shift. This guide explains what the treatment actually involves, how it works, and who tends to benefit most.

What Is Exolase One?

Exolase One is a laser facial treatment built around ONEpulse technology, a fused erbium laser that combines two wavelengths, a 2,940nm Erbium:YAG and a 1,540nm Erbium:Glass, delivered through a single beam to the same point on the skin. Rather than treating one concern at a time, it is designed to address several visible signs of ageing, including skin texture, fine lines, pigmentation, redness and loss of firmness, within a single session. Le Petit Saint is currently the exclusive home of this treatment in London.

How Exolase One's Fused Erbium Laser Works

Conventional laser resurfacing typically relies on a single wavelength, or requires switching between separate ablative and non-ablative devices to achieve different effects. Exolase One's fused approach combines both in one pulse. The Erbium:YAG component works at the skin's surface, removing a controlled, superficial layer with precision. The Erbium:Glass component reaches more deeply, working beneath the surface to stimulate the skin's own collagen production without disrupting the outer layer. Because both wavelengths are delivered to the same point on the skin at once, the treatment is designed to produce an even pattern of healing, rather than the inconsistent results that can occur when treatments are layered in separate passes.

What Exolase One Can Treat

Exolase One is designed around five of the most common signs of skin ageing: textural irregularity, fine lines and wrinkles, pigmentation, redness and skin laxity. Addressing these together, rather than through separate treatments for each concern, is intended to simplify what has traditionally been a multi-step approach to laser skin resurfacing. A full-face treatment can typically be completed in under ten minutes.

What a Treatment at Le Petit Saint Involves

Every Exolase One treatment at Le Petit Saint begins with a private consultation with one of our Aesthetic Doctors or Dermal Therapists, who will assess your skin and discuss your goals.

The treatment is offered at three levels: Gentle, suited to ongoing maintenance and glow with little to no downtime; Advance, suited to clearer signs of ageing such as texture, pigmentation or early loosening of the skin, usually given as a short course; and Intense, designed for more established signs of ageing and usually given as one or two sessions. Your practitioner will recommend the level best suited to your skin

What to Expect After Treatment

Recovery varies depending on the level of treatment chosen. A Gentle session typically involves little to no visible downtime, with many people comfortable returning to make-up the next day. An Advance session usually involves a few days of downtime, while an Intense session involves a longer recovery of around five to seven days, sometimes with some light flaking as the skin settles.

During treatment, most people notice warmth or a light prickling sensation, with some redness and warmth immediately afterwards. Results continue to develop gradually over the weeks following treatment, as the skin responds to the stimulation beneath the surface. Individual results vary, and your practitioner will talk you through what to expect based on the level chosen.

Who Tends to Suit This Approach

Exolase One tends to suit those looking to improve overall skin quality, whether addressing early signs of ageing or more visible texture, pigmentation or laxity concerns, without committing to the longer recovery associated with more aggressive laser resurfacing. As with any laser treatment, suitability depends on individual skin type and history, which is why every treatment at Le Petit Saint begins with a consultation.

A Doctor-Led Approach in Mayfair

As the exclusive provider of Exolase One, Le Petit Saint offers this treatment within the same doctor-led, consultation-first approach that shapes every treatment at the clinic. For further information on treatment suitability, preparation, recovery and aftercare, we invite you to explore our FAQs.