Glass Skin, Explained: The BB Laser (Lavieen) and the 1927nm Glow

Glass Skin, Explained: The BB Laser (Lavieen) and the 1927nm Glow

“Glass skin” is everywhere — that poreless, luminous, lit-from-within look made famous by Korean skincare. The treatment most associated with it is the BB Laser (sometimes called BB Glow), which at Lumini we perform with the Lavieen device. Let’s be honest and clear about what that means: “glass skin” is an aesthetic result — brighter, smoother, more even, more reflective skin — and the BB Laser is a real laser treatment that works toward it. Here’s the plain-language guide, with the actual science behind the technology.

The Lavieen is a 1927nm thulium fiber laser. That number — 1927 nanometers — is the wavelength of light it emits, and it’s the whole story. At 1927nm, the laser’s energy is strongly absorbed by water in the upper layers of the skin, which is exactly where dullness, uneven tone, sun spots, and rough texture live.

It’s a non-ablative fractional laser, meaning it doesn’t strip the surface off. Instead, it creates microscopic columns of treated tissue surrounded by untouched skin, so you get renewal with much less downtime than aggressive resurfacing.

Think of the top layer of your skin as a window. Over time, sun, pollution, and cell buildup leave that window cloudy — dull, blotchy, rough. The 1927nm laser works by gently treating that superficial layer so your skin sheds the old, pigment-laden, weathered cells and replaces them with fresh, evenly toned new ones.

Because the energy concentrates near the surface, it’s especially good at three things people associate with “glass skin”: brightening (clearing dullness), evening tone (fading sun spots and patchiness), and smoothing texture (refining the surface so it reflects light more uniformly). The luminous look isn’t a coating — it’s healthier, more even skin reflecting light the way young skin does.

The 1927nm wavelength has solid clinical support for tone, texture, and pigment. A 2023 prospective study of a non-ablative 1927nm fractional thulium laser found significant improvement in skin photoaging — including texture and pigmentation — with a good safety profile.¹ A randomized, split-face, double-blind trial compared a fractionated 1927nm thulium laser against a picosecond Nd:YAG laser for facial photorejuvenation, confirming the thulium laser as an effective rejuvenation tool.²

For pigment specifically, a study of nonablative 1927nm fractional resurfacing showed meaningful improvement in facial photopigmentation,³ and research in skin of color found that the 1927nm thulium laser successfully treated post-inflammatory hyperpigmentation — important because not every device is safe for deeper skin tones.⁴ A 2025 review in Lasers in Surgery and Medicine summarizes current trends for the 1927nm thulium fiber platform across rejuvenation and pigment.⁵ Pairing the laser with topical actives has also been studied: a 2025 trial combined a 1927nm thulium laser with salicylic acid and reported improved photoaging outcomes.⁶

A note of honesty: “BB Glow” is a marketing term, and the durable, evidence-backed results come from the laser’s effect on your own skin — brightening, smoothing, and evening tone — not from any pigment “deposited” into the skin. We focus on the real, studied mechanism.

The Lavieen BB Laser is our brightening-and-glow workhorse. We use it for dull, tired-looking skin, uneven tone, sun damage and brown spots, mild texture irregularity, and an all-over luminous refresh before an event. It pairs beautifully with a good skincare routine and sun protection.

How many sessions you need, what settings are safe for your skin tone, and whether the BB Laser is the best route to your goal are clinical decisions. Pigment conditions like melasma in particular need a careful, individualized plan, because the wrong settings can backfire. This isn’t something to guess at from a blog or a social trend. At Lumini, we assess your skin in person and build a plan that’s safe and effective for you.

The 1927nm thulium laser has a favorable safety profile, including in skin of color when settings are chosen correctly.⁴ Downtime is typically mild — redness and a sandpaper-like texture for a few days as the treated cells shed. Most patients do a series of 3–4 sessions spaced a few weeks apart for the best result, with the glow building as fresh skin surfaces. Sun protection and maintenance sessions help the results last.

We perform the BB Laser with the Lavieen 1927nm thulium fiber laser and tailor each session to your skin. Pricing is personalized at your consultation, since it depends on your goals and the number of sessions. Our team treats patients in English, Spanish, and Portuguese, serving Aventura, Sunny Isles, Bal Harbour, and North Miami Beach.

Is “glass skin” a real medical result? It’s an aesthetic look — brighter, smoother, more even skin that reflects light well. The BB Laser (Lavieen) works toward it by improving tone, texture, and pigment, which studies support.¹ ²

Does the BB Laser inject pigment into my skin? At Lumini, the result comes from the 1927nm laser improving your own skin, not from depositing pigment. The brightening and evening effect is the studied, durable mechanism.³

Is it safe for darker skin tones? The 1927nm thulium laser has been used safely in skin of color when settings are chosen carefully — including for hyperpigmentation.⁴ Your provider will tailor it to your skin.

How many sessions will I need? Most patients do 3–4, spaced a few weeks apart, with results building over the following weeks. Your exact plan is set at consultation.

Is there downtime? Expect mild redness and a rough, sandpaper-like texture for a few days as old skin sheds. Most people return to normal activities quickly.

1. Li X, et al. Prospective study of efficacy and safety of non-ablative 1927 nm fractional thulium fiber laser in Asian skin photoaging. Front Surg. 2023. PMID: 36950052.
2. Wu DC, et al. A Randomized, Split-Face, Double-Blind Comparison Trial Between Fractionated Frequency-Doubled 1064/532 nm Picosecond Nd:YAG Laser and Fractionated 1927 nm Thulium Fiber Laser for Facial Photorejuvenation. Lasers Surg Med. 2021. PMID: 32285983.
3. Brauer JA, et al. Nonablative 1927 nm fractional resurfacing for the treatment of facial photopigmentation. J Drugs Dermatol. 2014. PMID: 25607696.
4. Alharbi MA. 1927 nm Thulium Laser Successfully Treats Post-Inflammatory Hyperpigmentation in Skin of Color. Dermatol Res Pract. 2021. PMID: 33833793.
5. Friedman PM, et al. Current Trends and Future Directions of the Dual 1550-nm Erbium Glass Fiber and 1927-nm Thulium Fiber Non-Ablative Fractional Laser System. Lasers Surg Med. 2025. PMID: 40635144.
6. Qiao S, et al. Efficacy of combined 1927 nm thulium fiber laser and supramolecular salicylic acid in photoaging treatment. Lasers Med Sci. 2025. PMID: 40960645.

Medically reviewed by Dr. Thiago Queiroz, D.O., Medical Director, Lumini Medical Spa. Educational, not a substitute for an in-person consultation.