Texture and "Glass Skin" in aesthetic medicine: the synergy between two-phase peels and skin boosters

In recent years, the concept of Glass Skin —a term coined in Korean skincare to describe particularly smooth, even, hydrated, and luminous skin—has transcended the confines of home cosmetics, even influencing the language of aesthetic medicine.

More than a codified clinical parameter, Glass Skin represents a visual metaphor for good skin quality. In aesthetic medicine, the assessment of skin quality takes into account several aspects: uniformity of surface and color, hydration, firmness, elasticity, and luminosity.

Achieving healthy, radiant skin therefore requires a personalized approach that targets different levels of the skin's tissue. From this perspective, two-phase peels and skin boosters can be included within an integrated treatment plan: the former act primarily on the epidermal surface, while the latter aim to improve hydration and certain qualitative characteristics of the dermis.

Skin texture as an expression of skin quality

Skin texture is the result of the interaction between various biological and structural factors.

Regularity of the stratum corneum

Slow or uneven epidermal turnover can promote the accumulation of corneocytes and make the skin surface rougher and more irregular. Light is thus reflected less uniformly, and the complexion may appear dull and lifeless.

Integrity of the extracellular matrix

Collagen, elastin, and hyaluronic acid contribute to the skin's firmness and biomechanical properties. With aging and photodamage, the progressive alteration of these components can accentuate micro-wrinkles, loss of elasticity, and the visibility of pores.

Hydration and barrier function

An intact skin barrier helps limit transepidermal water loss and maintain a smooth, even surface. Conversely, dehydration and barrier disorders can make roughness, scaling, and fine lines more evident.

Smooth and luminous skin therefore does not only represent an aesthetic ideal, but can be associated with regular epidermal turnover, an efficient barrier function and adequately hydrated dermal tissue.

Visible pores, uneven texture and discoloration

To improve the overall quality of the skin surface, it is necessary to evaluate the main factors that compromise its uniformity.

Visibility of pores

Pores are physiological structures and cannot be eliminated or permanently "closed." Their visibility, however, can increase with sebum hypersecretion, accumulation of keratin, loss of perifollicular elasticity, and photoaging.

Treatment can therefore be aimed at reducing its appearance by intervening on keratinization, sebum production and the quality of the tissue surrounding the follicle.

Irregular grain and microrelief

Photodamage, keratinization alterations, dehydration, and superficial scarring can make the skin less uniform. Correction requires a careful assessment of the cause and depth of the irregularity.

Dyschromia

Solar lentigo, post-inflammatory hyperpigmentation, and melasma can disrupt the uniformity of skin tone. Because these conditions have different characteristics and depths, they cannot be treated with a single standardized protocol.

Two-Phase Peeling and Skin Booster: A Multi-Level Approach

The combination of two-phase peels and skin boosters is based on a complementary logic: the peel primarily targets the surface and epidermal renewal, while the skin booster works through intradermal microinjections aimed at improving hydration and skin quality.

This is not a universally recognized “gold standard,” but a possible combined strategy that must be adapted to the characteristics of the skin, the clinical indication, the products used, and individual tolerability.

1. The epidermal action of the two-phase peeling

Chemical peeling involves the controlled application of exfoliating substances capable of determining a predictable removal of the affected skin layers, subsequently activating the re-epithelialization and remodeling processes.

The depth and effect of the treatment depend on multiple variables: type of acid, concentration, pH, formulation, quantity applied, number of passes, application time and individual skin characteristics.

In a two-phase system, the exfoliating component can be combined with a second phase formulated to improve skin comfort and support it during and after treatment. The actual features and benefits, however, depend on the specific composition of the device.

Exfoliation and epidermal renewal

The controlled removal of surface cells helps to even out the skin texture and promote skin renewal. Over time, this process can improve the skin's radiance and the appearance of surface irregularities.

Improved appearance of pores

Exfoliation can reduce the accumulation of corneocytes and debris at the follicular ostium, making pores less visible. This effect doesn't result in permanent closure, but rather in improved smoothness of the surrounding surface.

Uniformity of complexion

By accelerating the turnover of the superficial epidermal layers, some peels can promote the progressive elimination of keratinocytes containing melanin and improve the appearance of certain superficial pigmentations.

The outcome, however, depends on the type of discoloration and skin type. In predisposed patients, an overly aggressive treatment can cause irritation and post-inflammatory hyperpigmentation; patient selection and photoprotection are therefore essential.

The role of the TCA

Trichloroacetic acid can be used at different concentrations to achieve peels of varying depths. Available evidence supports its use in the treatment of some signs of photoaging, but the concentration, application method, and indication should be determined by a physician.

However, it is incorrect to generically attribute to TCA a direct action of sebum dissolution or inhibition of tyrosinase: the improvement in texture and complexion is mainly linked to controlled chemoexfoliation and subsequent skin renewal processes.

2. The dermal action of skin boosters

Skin boosters are injectable products designed to improve certain qualitative characteristics of the skin without necessarily pursuing volumetric correction or a modification of the facial contours.

Their composition can vary and include free, stabilized or weakly cross-linked hyaluronic acid, alone or combined with other substances.

Intradermal hydration

Thanks to its ability to bind water, hyaluronic acid can help improve tissue hydration and softness. Available clinical studies show promising results in terms of hydration, radiance, texture, and, in some formulations, skin elasticity.

The effect, however, should not be described simply as a “pumping” of the tissue: the result depends on the rheological characteristics of the product, the injection depth, the technique and the individual response.

Support for the quality of the dermal matrix

Some hyaluronic acid formulations and the mechanical stimulation produced by microinjections can promote extracellular matrix remodeling processes. However, not all skin boosters exhibit the same biological behavior, and it is not possible to indiscriminately attribute clinically significant production of type I and III collagen to each product.

Formulations containing polynucleotides

Polynucleotides are being studied for their potential role in skin repair and biostimulation processes. Available evidence suggests potential improvements in texture, hydration, elasticity, and roughness, but studies are still heterogeneous and generally of low or moderate quality.

The results must therefore be communicated with caution, avoiding presenting as definitively demonstrated mechanisms or benefits that require further clinical confirmation.

The integrated protocol

Biphasic peels and skin boosters can be included in the same treatment plan to address different components of skin quality:

• peeling can improve smoothness, epidermal turnover and surface uniformity;
• the skinbooster can support hydration and contribute to the improvement of the skin's texture and biomechanical properties;
• Home skincare and photoprotection help maintain results and protect the barrier function.

Performing treatments in the same session is not always necessary or appropriate. The sequence and interval between treatments must be determined by the physician based on the depth of the peel, the injectable formulation, the condition of the skin barrier, the skin type, and the risk of inflammatory reactions.

In many cases, a sequential approach allows you to evaluate your skin's response to the first treatment before proceeding with the next.

Glowing skin through a personalized approach

The so-called medical Glass Skin should not be understood as artificially shiny or pore-free skin, but as the visible result of improved skin quality: a more uniform surface, adequate hydration, even complexion and natural radiance.

Two-phase peels and skin boosters can offer complementary effects, targeting the skin's most superficial and deepest layers, respectively. However, the results depend not only on the combination of treatments, but also on diagnosis, product selection, technique, proper time management, and a personalized protocol.

Only a medical approach tailored to the patient's individual characteristics can achieve a progressive, harmonious, and natural improvement in skin quality.

The information contained in this article is for informational purposes only and is not a substitute for evaluation, diagnosis, or treatment by a qualified physician.

Essential bibliography

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2. Soleymani T, Lanoue J, Rahman Z. A Practical Approach to Chemical Peels: A Review of Fundamentals and Step-by-step Algorithmic Protocol for Treatment. Journal of Clinical and Aesthetic Dermatology. 2018;11(8):21–28.
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4. Sitohang IBS, Legiawati L, Suseno LS, Safira FD. Trichloroacetic Acid Peeling for Treating Photoaging: A Systematic Review. Dermatology Research and Practice. 2021;2021:3085670. doi:10.1155/2021/3085670.
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7. Lampridou S, Bassett S, Cavallini M, Christopoulos G. The Effectiveness of Polynucleotides in Aesthetic Medicine: A Systematic Review. Journal of Cosmetic Dermatology. 2025;24. doi:10.1111/jocd.16721.