Skin Rejuvenation Glossary

Collagen is the most abundant structural protein in the skin, forming the dense fibrous network that gives skin its firmness, strength, and resilience. Produced by cells called fibroblasts in the dermis, collagen works alongside elastin to maintain the skin's architecture. From our mid-twenties, the body's natural collagen production begins to decline at a rate of approximately one percent per year — a gradual process that accelerates with sun exposure, environmental stress, and hormonal changes. The visible result is skin that loses firmness, develops fine lines, and becomes less able to spring back after movement. Many of the treatments offered at The Rejuvenation Space — including skin needling, PRP, PRF, and Rejuran — are specifically designed to stimulate new collagen synthesis, restoring the structural foundation that supports healthy, youthful skin from within.

Elastin is a protein found in the dermis that gives skin its elasticity — the ability to stretch and return to its original shape. Together with collagen, elastin forms the scaffolding that keeps skin taut, supple, and resilient. Like collagen, elastin degrades with age and is further depleted by UV exposure, smoking, and chronic inflammation. When elastin fibres break down and are not replaced at sufficient levels, the skin loses its snap and begins to sag, particularly around the jawline, under the eyes, and along the neck. Collagen-stimulating treatments such as skin needling and PRP therapy support elastin regeneration alongside collagen production, gradually restoring the skin's natural bounce and structural integrity over a series of treatments.

Skin rejuvenation is a broad term that encompasses any clinical approach designed to restore the health, function, and appearance of the skin by addressing its underlying biological processes — rather than simply treating the surface. True skin rejuvenation works at a cellular level, stimulating collagen and elastin production, promoting cellular turnover, reinforcing the skin barrier, and supporting the skin's natural capacity to repair and renew itself. At The Rejuvenation Space, skin rejuvenation is not a single treatment but a considered, personalised journey. It begins with an advanced consultation using the Observ 520x imaging system, which allows us to understand exactly what is happening beneath the surface of your skin before designing a bespoke treatment plan tailored to your specific concerns and goals.

Collagen Induction Therapy — also known as skin needling or microneedling — is a minimally invasive treatment that uses fine, sterile needles to create controlled micro-injuries in the skin's dermal layer. These micro-injuries trigger the body's natural wound-healing cascade, stimulating the production of new collagen, elastin, and hyaluronic acid in the treated area. Unlike ablative procedures, CIT preserves the integrity of the skin's outer layer while working beneath the surface to rebuild its structural foundation. It is particularly effective for improving fine lines, acne scarring, enlarged pores, skin texture, and overall skin tone. Results develop progressively over a series of treatments as collagen remodelling occurs, with continued improvement visible for weeks to months following each session.

Platelet-Rich Plasma (PRP) is a regenerative therapy derived from a small sample of the client's own blood. The blood is processed in a centrifuge to concentrate the platelets — cell fragments that are rich in growth factors including PDGF, TGF-β, VEGF, and EGF. When applied to the skin or injected into the dermis, these growth factors stimulate fibroblast activity, accelerate collagen synthesis, promote angiogenesis, and support deep cellular regeneration. Because PRP is derived from the client's own biology, it is highly biocompatible with minimal risk of adverse reaction. At The Rejuvenation Space, PRP is used as part of bespoke treatment plans for skin rejuvenation, facial volume restoration, and overall improvements in tone, texture, and elasticity.

Platelet-Rich Fibrin (PRF) is an advanced evolution of PRP therapy, produced using a lower-speed centrifugation process that results in a fibrin-rich gel containing concentrated platelets, white blood cells, and growth factors. Unlike PRP, which releases its growth factors rapidly upon application, PRF creates a sustained-release matrix — the fibrin scaffold slowly breaks down over days and weeks, delivering growth factors to the tissue in a more gradual, controlled manner. This prolonged release supports longer-lasting regenerative effects, making PRF particularly well-suited to facial rejuvenation, volume restoration in areas such as the under-eyes and mid-face, and hair loss treatment. PRF is entirely natural, derived from the client's own blood, and free from synthetic additives.

Rejuran is a skin healing treatment formulated with polynucleotides (PN) — long-chain DNA fragments derived from sustainably sourced salmon. Polynucleotides have a molecular structure closely compatible with human DNA, which allows them to integrate into the skin's extracellular matrix and actively stimulate tissue repair, cellular regeneration, and the production of new collagen and elastin. Injected superficially into the dermis, Rejuran works to restore hydration, improve skin elasticity, smooth fine lines, and strengthen thin, environmentally damaged, or ageing skin. It is particularly valued for improving overall skin quality and resilience rather than targeting isolated concerns, making it an excellent foundation treatment for any skin rejuvenation plan. Results develop gradually and naturally over four to eight weeks following treatment.

LED (Light Emitting Diode) light therapy is a non-invasive treatment that uses specific wavelengths of light to stimulate cellular activity within the skin. Unlike laser treatments, LED therapy does not generate heat or cause tissue damage — instead, it works by energising skin cells at a mitochondrial level, increasing ATP (adenosine triphosphate) production and enhancing the skin's natural capacity to repair, regenerate, and defend against stressors. Different wavelengths target different concerns: red light stimulates collagen production and reduces inflammation; blue light has antibacterial properties and is effective for acne-prone skin; and near-infrared light penetrates more deeply to accelerate healing and reduce pain. LED therapy is gentle, requires no downtime, and serves as both a standalone treatment and a powerful complement to more intensive procedures.

The Observ 520x is a clinical-grade skin imaging system that uses advanced multi-spectral lighting technology to reveal detailed information about the skin at both the epidermal and dermal layers — information that is entirely invisible to the naked eye. During a skin consultation at The Rejuvenation Space, the Observ 520x allows our clinicians to assess subclinical sun damage, early collagen degradation, pigmentation patterns, vascular irregularities, sebaceous activity, and barrier dysfunction with a level of precision that transforms the consultation from observation to clinical analysis. This comprehensive skin intelligence forms the foundation of every bespoke treatment plan we design — ensuring that our recommendations are grounded in evidence and precisely tailored to what your skin genuinely needs.

Hyaluronic acid (HA) is a naturally occurring polysaccharide found throughout the body, with particularly high concentrations in the skin, joints, and eyes. In the skin, HA plays a critical role in maintaining hydration — a single molecule can hold up to one thousand times its weight in water — and contributes to the skin's suppleness, plumpness, and overall resilience. With age, the skin's natural HA content declines significantly, contributing to dryness, loss of volume, and a reduction in the skin's ability to maintain a healthy moisture balance. Some skin rejuvenation treatments, including skin needling and Rejuran therapy, support the restoration of the skin's own hyaluronic acid reserves by stimulating fibroblast activity and improving the overall quality of the extracellular matrix.

Fibroblasts are the primary cells responsible for producing and maintaining the extracellular matrix of the dermis, including collagen, elastin, and hyaluronic acid. They are central to the skin's structural integrity and its capacity to repair itself following injury or stress. As we age, fibroblast activity naturally declines, resulting in reduced production of the structural proteins that keep skin firm, hydrated, and resilient. Many of the advanced skin rejuvenation treatments offered at The Rejuvenation Space — including skin needling, PRP, PRF, and Rejuran — work by directly stimulating fibroblast activity, effectively signalling the skin to produce fresh collagen and elastin and restore the dermal architecture that supports a healthy, youthful complexion.

The skin barrier — also known as the stratum corneum or epidermal barrier — is the outermost layer of the skin, functioning as the body's primary defence against environmental aggressors, pathogens, pollutants, and transepidermal water loss (TEWL). A healthy, intact skin barrier is essential for maintaining hydration, regulating sensitivity, and supporting overall skin health. When the barrier is compromised — through over-exfoliation, harsh products, environmental damage, or chronic inflammation — the skin becomes reactive, dry, prone to irritation, and more vulnerable to accelerated ageing. Restoring and strengthening the skin barrier is a foundational priority in any skin rejuvenation plan, and treatments such as Rejuran and LED light therapy are particularly effective at supporting barrier repair and long-term resilience.

Polynucleotides (PN) are long-chain DNA fragments typically derived from sustainably sourced salmon DNA, which shares a high degree of structural compatibility with human DNA. When introduced into the skin through superficial injection, polynucleotides act as biological scaffolding, stimulating fibroblast proliferation, promoting tissue regeneration, and enhancing the skin's natural repair mechanisms at a cellular level. They also demonstrate potent antioxidant and anti-inflammatory properties, making them particularly beneficial for environmentally stressed, thin, or sensitised skin. Polynucleotide therapy — most widely known under the brand name Rejuran — is recognised for improving skin quality, elasticity, and hydration in a gradual, natural manner, delivering results that reflect genuine biological renewal rather than surface-level change.

Growth factors are naturally occurring proteins that act as signalling molecules, instructing cells to proliferate, differentiate, migrate, and repair tissue. In the context of skin rejuvenation, growth factors derived from platelets — concentrated through PRP and PRF therapies — play a pivotal role in stimulating the skin's regenerative cascade. Key growth factors in skin biology include Platelet-Derived Growth Factor (PDGF), Transforming Growth Factor-beta (TGF-β), Vascular Endothelial Growth Factor (VEGF), and Epidermal Growth Factor (EGF). Together, these proteins activate fibroblasts, promote angiogenesis, accelerate collagen and elastin synthesis, and enhance the skin's overall capacity to heal and renew. Because they are derived from the client's own biology, growth factor therapies such as PRP and PRF are inherently biocompatible and work in harmony with the body's natural healing intelligence.

Microneedling is another term for skin needling or Collagen Induction Therapy — a minimally invasive treatment in which a device fitted with fine, sterile needles is passed across the skin to create thousands of controlled micro-channels in the dermis. These micro-injuries are precisely calibrated to stimulate the skin's wound-healing response without causing lasting damage, triggering a cascade of cellular activity that results in the production of new collagen, elastin, and hyaluronic acid. Microneedling can be performed across the face and body and is effective for a wide range of concerns including fine lines, acne scarring, enlarged pores, uneven texture, and mild skin laxity. It is frequently combined with PRP or PRF — applied topically during treatment — to amplify the regenerative benefits and accelerate results.

Dermal remodelling is the process by which the dermis — the deeper structural layer of the skin — rebuilds and reorganises its collagen and elastin network in response to injury, treatment, or biological stimulus. It is a natural and continuous process, but one that slows significantly with age. In the context of skin rejuvenation, dermal remodelling is the biological mechanism through which treatments such as skin needling, PRP, PRF, and Rejuran deliver their results. Rather than producing immediate surface-level change, these treatments work by triggering a remodelling cascade that unfolds over weeks to months as new collagen fibres are laid down, matured, and integrated into the existing dermal architecture. This is why the most significant and lasting results from regenerative skin treatments build progressively over a series of sessions.

Transepidermal water loss (TEWL) refers to the passive diffusion of water through the skin's outer layers into the surrounding environment. In healthy skin with an intact barrier, TEWL is kept at minimal levels, maintaining the skin's hydration, suppleness, and resilience. When the skin barrier is compromised — through damage, chronic inflammation, harsh skincare, or environmental factors — TEWL increases, leading to dryness, sensitivity, tightness, and accelerated visible ageing. Measuring and addressing TEWL is an important part of assessing skin health, and barrier-supportive treatments such as Rejuran and LED light therapy are particularly effective at reducing TEWL over time by strengthening the structural integrity of the epidermal layer and supporting the skin's natural moisturising mechanisms.

Adenosine triphosphate (ATP) is the primary energy currency of every living cell, including skin cells. It powers virtually all cellular functions — from protein synthesis and DNA repair to cell division and waste removal. In the context of LED light therapy, specific wavelengths of red and near-infrared light are absorbed by chromophores within the mitochondria, stimulating increased ATP production. This cellular energy boost enhances the skin's capacity to repair damage, synthesise collagen and elastin, regulate inflammation, and defend against environmental stressors. The result is skin that functions more efficiently at a biological level — more resilient, more capable of renewal, and more responsive to the other regenerative treatments in a bespoke skin rejuvenation plan.

Skin laxity refers to the gradual loosening and loss of firmness in the skin, most commonly associated with the natural ageing process and the cumulative decline of collagen, elastin, and subcutaneous fat. It is most visible along the jawline, around the eyes, in the neck, and in areas of the face where volume loss is pronounced. Environmental factors such as prolonged sun exposure, smoking, and significant weight fluctuation can accelerate the development of skin laxity. While severe laxity may require surgical intervention, mild to moderate laxity responds well to regenerative treatments that stimulate collagen production and improve dermal density. At The Rejuvenation Space, treatments including skin needling, PRP, PRF, and Rejuran are used within bespoke treatment plans to progressively restore tone, firmness, and structural integrity to lax skin.

Photodamage — commonly referred to as sun damage — is the cumulative effect of ultraviolet (UV) radiation on the skin's structure and function over time. UV exposure is the single greatest extrinsic contributor to skin ageing, responsible for the breakdown of collagen and elastin fibres, the development of pigmentation irregularities, changes in vascular architecture, and an increased risk of skin cancer. In clinical practice, photodamage is often more extensive than it appears on the surface — the Observ 520x imaging system used at The Rejuvenation Space can reveal subclinical UV damage in the deeper layers of the skin that is not yet visible to the naked eye. Addressing photodamage is frequently a core component of a bespoke skin rejuvenation plan, with treatments such as LED, skin needling, PRP, and Rejuran each contributing to the repair and renewal of UV-stressed skin.

Fine lines are the earliest visible signs of skin ageing — shallow creases that develop as collagen and elastin levels decline and the skin loses its capacity to spring back from repeated facial movement and environmental stress. Wrinkles are deeper, more established versions of these creases, often reflecting years of cumulative collagen loss, photodamage, and volume depletion beneath the skin's surface. The most effective approach to both fine lines and wrinkles addresses the underlying cause rather than simply the surface appearance — stimulating the skin to rebuild its own structural proteins through regenerative treatments. At The Rejuvenation Space, skin needling, PRP, PRF, and Rejuran are all effective modalities for progressively softening fine lines and improving overall skin quality as collagen remodelling occurs over a series of treatments.

Acne scarring occurs when the skin's inflammatory response to a breakout damages the underlying dermis, disrupting the normal collagen deposition process during healing. The result is textural irregularity — most commonly in the form of atrophic (depressed) scars such as ice pick, boxcar, or rolling scars — that can persist long after active acne has resolved. These scars reflect a deficit of collagen in the affected area rather than surface pigmentation, which is why topical products alone are rarely effective in addressing them. Skin needling (Collagen Induction Therapy) is one of the most evidence-supported treatments for atrophic acne scarring, creating a controlled stimulus for collagen production that gradually fills and smooths the scar tissue over multiple sessions. PRF and Rejuran may also be incorporated to accelerate healing and improve overall skin quality.

Skin pigmentation refers to uneven distribution of melanin — the pigment responsible for skin colour — resulting in areas of discolouration such as sunspots, melasma, post-inflammatory hyperpigmentation (PIH), and age spots. Pigmentation concerns are among the most common reasons people seek skin rejuvenation treatment, and they are also among the most nuanced to address, as different types of pigmentation have different underlying causes and respond differently to treatment. An accurate assessment of pigmentation type is essential before treatment — the Observ 520x at The Rejuvenation Space is particularly valuable in this context, as it can distinguish between superficial and deep pigmentation that may not be visible under normal lighting. Treatment protocols for pigmentation are highly individualised and may incorporate skin needling, LED light therapy, and homecare regimens tailored to the specific pigmentation pattern.

Skin texture refers to the smoothness, evenness, and refinement of the skin's surface — qualities that reflect the health of both the epidermis and the underlying dermis. Rough, uneven, or congested skin texture can result from enlarged pores, acne scarring, keratosis pilaris, sun damage, or the gradual decline of cellular turnover that accompanies ageing. Improving skin texture is one of the most commonly requested outcomes in skin rejuvenation, and it is one of the areas where treatments such as skin needling, PRP, and PRF consistently deliver meaningful, visible results. By stimulating collagen production and promoting cellular regeneration at a dermal level, these treatments gradually refine the skin's surface from the inside out — producing improvements in smoothness, pore appearance, and overall skin quality that are both visible and lasting.

A minimally invasive treatment is any clinical procedure that achieves therapeutic results by working below the skin's surface without requiring surgery, general anaesthesia, or significant disruption to the surrounding tissue. In skin rejuvenation, minimally invasive treatments include skin needling, PRP, PRF, Rejuran, and injectable aesthetic treatments — each of which works at a dermal level to stimulate biological change while preserving the integrity of the skin above. The appeal of minimally invasive approaches lies in their combination of meaningful, lasting results and manageable recovery. Most clients can return to normal activities within a short period following treatment, and the progressive, natural-looking improvements that develop over subsequent weeks align with the philosophy of working with the body's own healing intelligence rather than imposing dramatic, immediate change.