Glowing Skin, the True Meaning According to Dermatology

DIORE CLINIC

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"Honey glow," "dewy glow," "radiance"... What Do Those Words Really Mean?

While looking in the mirror, you may have thought, "My skin has a bit of glow today." Beauty ads are full of words like "radiance," "dewy glow," and "honey glow." But when it comes to defining them precisely in a clinical setting, the meaning is surprisingly vague.

Interestingly, in recent years, dermatology has been actively studying how to define, measure, and improve "skin glow / radiance" scientifically. To put it simply, glow is a matter of how skin and light meet.

Glow Is a Three-Step Conversation Between Light and Skin

In dermatology, glow is essentially an optical phenomenon. Light that reaches the skin goes through three pathways, and when these three are balanced, we perceive skin as "glowing."

1. Surface reflection

When the skin surface is smooth and sufficiently hydrated, light reflects cleanly at a consistent angle. If the surface is rough or flaky, light scatters in all directions, creating a dull impression.

2. Absorption by pigments

Melanin (skin pigment) and hemoglobin (blood tone) absorb part of the light. The more evenly pigments are distributed, the more uniform the tone becomes, while blotchy pigmentation (melasma, spots, redness) reduces glow.

3. Dermal back-scattering

Some light penetrates into the dermis and, after hitting collagen fibers, scatters back to the surface. This is the source of what we often call "glow that seems to come from within."

What Recent Research Says About Glow: "The Absence of Flaws"

A 2024 study by Goodman and colleagues published in the Journal of Cosmetic Dermatology presented an interesting perspective on defining glow. Rather than measuring glow as a single indicator, the researchers proposed a framework that evaluates how few glow-detracting factors are present.

The factors that reduce glow can be broadly divided into three categories:

• Color-related: redness, telangiectasia, pigmentation (melasma, post-inflammatory hyperpigmentation), hypopigmentation
• Surface texture-related: rough texture, buildup of dead skin cells, enlarged pores, fine lines
• Dermal structure-related: reduced collagen, decreased elasticity

Around the same time, a research team led by Sachdev in India developed an objective tool for evaluating glow (the MSCR Glow & Radiance Index) and suggested that hydration, surface uniformity, tone uniformity, texture, and gloss should be assessed together as five integrated elements.

Four Pillars of Clinical Glow

From a dermatological perspective, creating glow means optimizing the three optical elements above at the same time. At Dior Clinic, when evaluating patients' glow, we also look at the following four pillars together.

① Dermal hydration — Procedures such as hyaluronic acid-based skin boosters or Rejuran increase the dermis's moisture-retention capacity and enrich back-scattering.

② Collagen density — Dermal-stimulating procedures such as HIFU (Ulthera, Shurink), RF (Thermage, InMode), and Potenza improve the density and alignment of collagen fibers, helping light scatter more effectively.

③ Pigment uniformity — Pico lasers (such as PicoSure), IPL, and toning treatments even out melanin distribution and refine the overall tone.

④ Surface texture — Chemical peels, mild exfoliation, and superficial lasers remove dead skin cells and smooth the surface, making surface reflection more uniform.

Improving even one of these four pillars can enhance glow, but only when all of them are aligned does the impression of being "lit from within" truly come together.

Four Principles for Preserving Glow in Daily Life

Glow is not limited to procedures. Preserving the glow achieved through treatment ultimately comes down to daily care.

1. Protect the moisture barrier — Use products containing ceramides, NMF (natural moisturizing factors), and hyaluronic acid to maintain the stratum corneum's water-retention ability.
2. Wear sunscreen — This is one of the most powerful anti-aging measures for preventing collagen breakdown and pigment irregularities.
3. Avoid excessive exfoliation — Too frequent peeling can instead cause surface roughness and barrier damage.
4. Antioxidant care — Vitamin C, niacinamide, and similar ingredients help with pigment uniformity and the dermal environment.

Frequently Asked Questions (Q&A)

Q1. Are glow and skin tone (brightness) the same thing?

No. Tone refers to the color itself caused by melanin and hemoglobin, while glow is a broader concept that combines how tone, surface, and dermis interact with light. A darker tone can still have rich glow, and conversely, a lighter tone can still look dull.

Q2. How is makeup-created glow different from the skin's own glow?

Cosmetic glow mainly works by artificially enhancing surface reflection (pearls, film-forming ingredients). On the surface they may look similar, but the skin's own glow is a three-dimensional light that appears when dermal back-scattering is also abundant.

Q3. Can one treatment create glow in a single session?

Glow can improve even immediately after a single skin booster or peel. However, the effect typically lasts from several days to several weeks depending on the treatment. For lasting glow, cumulative care that improves the dermal environment is needed.

Q4. Can oily skin still be considered to have glow?

Gloss and glow are different concepts. Shininess caused by excess oil is a state of overly strong surface reflection, which is actually far from a balanced glow. True glow is created when the skin has a proper oil-water balance and a smooth surface.

Q5. What treatment is most effective for glow?

Rather than "the single most effective" treatment, we first evaluate which pillar is lacking based on the patient's skin condition. If dermal hydration is insufficient, a skin booster is considered; if collagen has weakened, HIFU or RF may be prioritized; if tone is uneven, toning treatments may come first. At Dior Clinic, we first identify the factors reducing glow and then suggest the right combination.

Closing

Glowing skin is not simply "skin that shines," but the result of a smooth surface, even tone, and healthy dermis being present at the same time. There is certainly a role that cosmetics can fill, but true glow that comes from within ultimately comes from the structural health of the skin itself.

Skin glow is not a goal that ends with a single procedure, but rather a journey of understanding your own skin accurately and filling in the areas that are lacking. As the chief physician at Dior Clinic, when I examine each patient's skin, this is why I first look at which pillar is holding back their glow.